Cellular Network Not Available for Voice Calls On Oppo A18 | Dr.fone

Cellular Network Not Available for Voice Calls On Oppo A18 | Dr.fone

Ariadne Lv13

Cellular Network Not Available for Voice Calls On Oppo A18

The “Cellular Network Not Available for Voice Calls“ error is a common experience for many Android users. In our contemporary world, communication stands as the fundamental pillar of our existence. Yet, the malfunctioning of our devices hinders this connectivity. It often gives rise to numerous complications. Fortunately, your concerns are now a thing of the past.

This article serves as your guide for troubleshooting and overcoming this frustrating dilemma. It has compiled expert perspectives, valuable tips, and detailed, systematic solutions. The article will go through the underlying causes behind this issue and explore potential fixes. By the conclusion of this article, you’ll be armed with the necessary knowledge to tackle this problem.

cellular network not available calls error

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Part 1. Preliminary Reasons For Cellular Network Not Available For Voice Calls

Facing the “Cellular Network Not Available for Voice Calls Android“ error can be overwhelming. Thus, it becomes evident that specific reasons underlie this issue. Solutions indeed exist to tackle this problem. Yet, comprehending the underlying reasons is equally crucial to resolve the issue:

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1. Internet Access

One primary reason behind cellular network unavailability glitches lies in unstable internet access. Voice calls over cellular networks often require a stable internet connection. When this connection fluctuates or drops, it can result in the dreaded error message.

2. Terrain Coverage

Another contributing factor is the geographical terrain. In remote or sparsely populated areas, cellular tower coverage might be limited. It causes a signal disturbance or complete loss of the network.

3. Network Congestion

During peak usage hours or in densely populated areas, network congestion can also be a cause. It leads to temporary unavailability of the cellular network for voice calls. When the network is overloaded with traffic, it might struggle to accommodate more voice calls. That results in connectivity issues.

4. Technical Glitches

Furthermore, technical glitches within the Oppo A18 device or network infrastructure can cause this issue. These glitches could range from software bugs to hardware malfunctions.

5. Battery or Power Issues

In some instances, insufficient battery power or power-saving modes on devices can cause this issue. They affect the Oppo A18 device’s capacity to sustain a consistent connection with the cellular network. This consequently causes voice call unavailability.

Part 2. Prominent Solutions For Cellular Network Not Available For Voice Calls Android

A myriad of purposeful solutions exists to resolve the TracFone cellular network not available for voice calls issue. These solutions are specifically designed to address various underlying causes. The aim of these solutions is to restore smooth connectivity for voice calls. Described below are the top 8 solutions to fix the “Cellular Network Not Available” error:

Method Efficiency Difficulty Duration (Minutes)
Check Network Availability Moderate Easy 5-10
Check Airplane Mode Low Easy 2-5
Select Network Operator Moderate Moderate 5-10
Restart Device Low to Moderate Easy 3-5
Enable Roaming Settings Moderate Easy 3-7
Update Android Smartphone Moderate Moderate 15-30
Performing Factory Reset High (Last Resort) Difficult 30-60+
Contact Carrier Provider High (Specialized Help) Moderate Varies (Depends on Carrier Provider)
Wondershare Dr.Fone - System Repair Highest (Complex Issues) Easiest 5-10

Solution 1. Check the Availability of Cellular Networks

Before diving into complex fixes, the first thing to do is to check if nearby cell networks are available and how strong their signals are. It is an essential step when trying to fix the “Cellular Network Not Available“ error. This basic check ensures your phone is close enough to a working network tower, which matters for staying connected. It allows you to find out the availability of nearby cellular networks.

Moreover, with it, you can ensure your device is connected to a reliable network. This preliminary check sets the foundation for further troubleshooting.

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checking network availability

Solution 2. Check the Airplane Mode of the Smartphone

Another crucial step in resolving this error involves ensuring that the Airplane Mode is disabled. This mode, when activated, disables all wireless connections. It also includes cellular networks, which could lead to connectivity issues. Follow these simple steps to check and disable Airplane Mode on your device:

Instructions: Swipe down on your phone’s screen from the top to access the Notification Panel, unveiling the Quick Settings tiles. Search for the airplane-shaped icon; if Airplane Mode is active, the icon will be highlighted or shown in a distinct color. Tap the Airplane Mode to turn off the Airplane Mode on your Android.

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toggle airplane mode

Solution 3. Selecting the Network Operator of the Oppo A18 device

In certain instances, manually selecting your network operator can help. It effectively resolves the “Cellular Network Not Available for Voice Calls Android“ error on your Oppo A18. By choosing the network operator manually, you ensure a deliberate connection to a specific carrier. This potentially bypasses issues related to automatic network selection. Follow these steps to select your network operator manually:

  • Step 1. Access “Settings” on your Oppo A18, then tap on “Connections.” From there, navigate to “Mobile Networks” and proceed by selecting “Network Operators.”

open mobile network carriers

  • Step 2. Look for the “Automatically Select” toggle, which will be turned on. Toggle it off to see available networks and choose the one best suited to your device.

select mobile carrier

Solution 4. Restart Your Device

Sometimes, resolving the “Cellular Network Not Available for Voice Calls“ error on your Oppo A18 can be as simple as performing a restart. This basic troubleshooting step helps refresh the Oppo A18 device’s software. It clears temporary glitches and reestablishes essential connections, potentially resolving network-related issues. Follow these straightforward steps to restart your Oppo A18:

Instructions: Hold down the “Power” button until the Power menu emerges on the display. From there, select “Restart” to initiate the Oppo A18 device’s reboot process.

restart android device

Solution 5. Enable Roaming Settings

There are situations where you’re in an area with weak or no coverage from your primary network provider. In such a case, enabling roaming settings on your Oppo A18 can sometimes resolve the issue at hand. Enabling roaming allows your device to connect to partner networks. This extends your coverage beyond your home network’s reach. Follow these steps to enable roaming settings on your Oppo A18:

  • Step 1. Start by accessing your device’s Settings and tapping the “Connections” option. Here, scroll downward to press “Mobile Networks.”

open mobile network connections

  • Step 2. Presently, you will encounter the “Data Roaming” option. Toggle this option on to enable data roaming on your device and resolve the issue.

turn on data roaming

Solution 6. Update Android Smartphone

Updating your Oppo A18’s OS to the latest version can often resolve performance issues. It can also fix network connectivity issues, including the “Cellular Network Not Available” error. Manufacturers regularly release system updates containing bug fixes and security patches. It also includes enhancements that can address underlying software-related problems. Follow these steps to update your Android smartphone:

  • Step 1. In your device’s Settings, scroll through to find the “Software Update” option. Select it, and on the subsequent screen, verify the availability of any updates.

open software update settings

  • Step 2. If an update is accessible, select the ‘Download and Install’ choice. Then, proceed by following the prompts displayed on the screen to finalize the process.

install updates on android

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Solution 7. Performing Factory Reset

Performing a factory reset is a drastic but effective measure. It can resolve persistent software-related issues, including the “Cellular Network Not Available” error. Be aware that initiating a factory reset results in the deletion of all data and settings stored on your device. Hence, it is crucial to back up any vital information before proceeding with this action. Here is how to fix the Verizon cellular network not available for voice calls:

  • Step 1. To access your device’s “General Management” section, navigate through Settings. There, tap on “Reset,” and select “Factory Data Reset” from the subsequent screen.

open reset settings

  • Step 2. You will need to tap “Reset” to confirm your choice. Then, follow the on-screen guidelines carefully to complete the reset process.

perform factory reset

Solution 8. Contact Carrier Provider

If you’ve exhausted all options and the issue persists, reaching out to your carrier provider for assistance is a viable solution. Carrier providers can offer specific insights and guidance regarding network-related issues. When connected to customer service, explain the issue you’re experiencing in detail. Contacting your carrier provider enables you to tap into their expertise and resources.

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Part 3. [100% Resolvable] Resolve Cellular Network Not Available For Calls Issues

Despite all your attempts, the cellular network not available for voice calls remains unresolved. It might state a more complex software-related issue or glitch within the Oppo A18 device. However, there’s a solution designed explicitly for addressing such complex issues. That software is Wondershare Dr.Fone, a comprehensive toolkit for Android devices. It stands out as the world’s first one-click Android repair tool.

Dr.Fone specializes in resolving a wide array of Android system issues, including the notorious black screen of death. With this tool, users can effortlessly restore their Android system to normal functionality.

Key Features of Wondershare Dr.Fone

  1. Fone’s advanced repairing mechanism has the ability to repair even the bricked Android devices.
  2. This tool supports more than 1000 models of Android devices across different brands for system repair.
  3. It boasts the highest success rate when it comes to fixing Android devices.

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Steps Needed To Fix the Cellular Network Not Available for Calls Issue via Wondershare Dr.Fone

The following are the steps to resolve the Tracfone cellular network not available for voice calls using Wondershare Dr.Fone:

  • Step 1. Open Wondershare Dr.Fone and Opt for System Repair

Launch the software. Then, navigate to the “Toolbox” section located in the left panel. Connect your Oppo A18 and proceed by choosing “System Repair.” Then, opt for “Android” to specify the Oppo A18 device type. On the subsequent screen, click “Start” to commence the repair procedure.

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start android repair

  • Step 2. Provide Details of Your Android Device

The system automatically identifies the brand of the Android device undergoing repair. Afterward, choose the “Name,” “Model,” “Country,” and “Carrier” from the provided list options. If the Oppo A18 device is already unlocked, you can choose OPEN in the Carrier section. Then, confirm by checking the warning box indicating agreement and readiness to proceed. Click on “Next” to initiate the repair process for your Oppo A18.

define details of android

  • Step 3. Complete the Android Repair Process Successfully

Follow the guidance displayed on your device’s screen to access Download Mode. Once in, the firmware download begins automatically. During this process, the platform verifies and presents the firmware details. Select “Fix Now” to proceed with the installation of the firmware onto your Oppo A18. Since Android repair will result in the deletion of all data, input “000000” to confirm. This action initiates the system repair process.

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Conclusion

In conclusion, facing the “Cellular Network Not Available for Voice Calls“ problem on your Oppo A18 can be frustrating. This article has explored many ways to fix this issue. These include simple checks like turning off Airplane Mode to solutions like contacting your carrier. However, when facing persistent network problems, a tool like Wondershare Dr.Fone becomes the only hope.

Among the various methods discussed, Dr.Fone stands out as a top choice. Its thorough system repair function targets and removes complex software glitches. The tool’s easy interface, broad compatibility, and secure repair process make it perfect. It is ideal for users looking for a reliable solution beyond regular troubleshooting.

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Full Guide: How To Fix Connection Is Not Private on Oppo A18

Are you encountering the “your connection is not private” issue on your phone? We found many Android users have increasingly expressed their frustrations with this recurring problem while browsing on the internet.

Usually, you can just reload the page to fix the error. But in case it doesn’t help, you may need to look for more advanced solutions. In the following discussion, we will delve into why this “your connection is not private” on Android happens and explore solutions that work for you.

Part 1: Addressing Your Connection Is Not Private on Android

First of all, what does “your connection is not private” on Android mean? To answer this question, it’s essential to understand that this error is often associated with Secure Socket Layer (SSL) protocol issues.

SSL is a cryptographic protocol created to establish a secure communication channel over the internet. Its primary purpose is to ensure the confidentiality and integrity of data exchanged between a user’s device and a website’s server.

The error message appears when there’s a problem with the SSL/TLS (Transport Layer Security) certificate of the website you are trying to access. This certificate is a digital document that authenticates the website and encrypts the data transmitted between the user’s device and the server.

Your connection is not private error on Android.

Some common factors that could trigger the “your connection is not private” on Chrome Android error:

  1. Expired or invalid SSL certificate of the website;

Certificates are issued for a specific period, and if the website owner fails to renew it in time, your browser will detect it as not secure.

  1. There is a mismatch between the domain on the certificate and the actual domain you are trying to visit;

This discrepancy might occur due to a misconfiguration on the website or, in some cases, due to a man-in-the-middle attack where a third party intercepts the communication between your device and the server.

  1. No HTTPS enforcement;

Another reason for the issue is if the installed SSL certificate doesn’t turn on the “force HTTPS” option. This means visitors might be using the non-secure HTTP version of the site instead of the safe URL.

So, the error serves as a warning to users, indicating that the connection may not be secure and sensitive information could be at risk.

Browsers, including those on Android devices, prioritize user safety and privacy. They will block access to potentially compromised websites to prevent data theft or unauthorized access. That’s why when you get the “your connection is not private” message on Android, you can’t access the website.

Part 2: What The Error Codes in “Your Connection Is Not Private” Mean

When “your connection is not private” on Chrome Android error shows up, it often comes along with specific error codes that can indicate the root cause of the issue. Understanding these error codes is crucial for troubleshooting and resolving the problem effectively.

  1. ERR_CERT_SYMANTEC_LEGACY: Unsupported Symantec-issued certificate

This error code indicates that the website you are attempting to access is equipped with an unsupported Symantec-issued certificate. Symantec, a prominent Certificate Authority, had faced concerns about the security of its certificate issuance processes.

As a result, major browsers, including Google Chrome, no longer support certificates issued by Symantec. If you encounter this error, it implies that the website’s SSL certificate is outdated and needs to be updated with a certificate from a trusted Certificate Authority.

  1. NET::ERR_CERT_AUTHORITY_INVALID: Unauthenticated SSL certificate

The presence of this error code suggests that the SSL certificate of the website cannot be authenticated by your browser. This could occur if the certificate is self-signed or issued by an unrecognized Certificate Authority.

  1. NET::ERR_CERT_DATE_INVALID: Date and time mismatch

This error code points to a discrepancy between your Oppo A18’s date and time settings and the information on the website’s SSL certificate, as they have expiration dates. If the date and time settings on your device are incorrect, it may prevent the certificate from being validated. Correcting your device’s date and time settings should resolve this issue.

  1. SSL certificate error: Generic or unspecified problem

This is a more generic error message that indicates a problem with the website’s SSL certificate without specifying the exact nature of the issue. It could indicate various issues, such as an expired certificate, a misconfiguration in the certificate chain, or other SSL-related problems.

Part 3: How To Fix Your Connection Is Not Private on Android

Encountering the “your connection is not private” error on Android can be a frustrating experience. Fortunately, there are various methods to address and fix this issue, depending on its underlying cause.

In this section, we will explore some effective solutions to help you regain a secure and private connection.

Method 1: Clear your cache

When you use the internet, web browsers store information about your online activities in cached data and cookies to speed things up. However, having too much of this data can cause problems instead. It might even stop your browser from connecting securely.

So, clearing your browser cache and data can be a quick and simple “your connection is not private” Android fix. Follow the steps here:

  • Step 1: Open and launch Chrome.
  • Step 2: Access the Menu (the three dots button) to open the Settings. Select Privacy and Security > Clear Browsing Data.
  • Step 3: Opt for the “All Time” option and click “Clear Data” to erase your cache.

Clear the browser's cache and data.

After successfully clearing your browser cache and data, revisit the website to check if the problem persists.

Method 2: Repair the Android system

Addressing the “your connection is not private” to fix on Android involves examining both the Oppo A18 device and the website. If clearing browser data doesn’t help, there might be an issue with your Android system. One solution is to use the Wondershare Dr.Fone system repair tool to fix the issues safely.

How to perform system repair with Dr.Fone:

  • Step 1. Open the Repair Tool

Start by launching Wondershare Dr.Fone on your computer. Go to the Toolbox section and connect your Oppo A18. Choose System Repair and pick Android as your device type.

Open Dr.Fone System Repair tool.

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  • Step 2. Begin Repair

Click Start on the new screen to kick off the repair. Since you’re dealing with a connection private issue on Android, select System Damage.

Select the problem and begin the repair.

  • Step 3. Fill in the Oppo A18 device Details

The platform will detect your Oppo A18’s brand. Confirm the Name, Model, Country, and Carrier. If your device is unlocked, choose OPEN in the Carrier section. Agree to the warning, click Next, and proceed with the repair.

Confirm your Oppo A18's details.

  • Step 4. Activate Download Mode

Follow the instructions to put your Oppo A18 into Download Mode. Once in Download Mode, you will start downloading the firmware.

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Activate Download mode to download the firmware.

  • Step 5. Confirm Installation

Remember, the repair may erase data. It’s advisable to back up your data first before starting the repair. Enter “000000” to confirm the repair process, shown by a progress bar.

Confirm the repair process.

When done, click Done if your Android starts properly. If not, click Try Again to repeat the process.

Method 3: Check and fix the date and time on your Android

Since the error code “NET::ERR_CERT_DATE_INVALID” indicates a mismatch between the date and time on your device and your browser, you need to adjust the date and time settings on your Android to fix it.

The specific steps can vary based on your Android model, but the general approach involves locating the “date and time” settings on your phone. How to fix the date and time on Android to bypass “your connection is not private” on Chrome Android:

  • Step 1: Go to your Oppo A18’s Settings > Date & Time.
  • Step 2: Switch on the “Automatic Date & Time” to sync with the network-provided time.

Check and fix the Android's date and time.

Method 4: Perform factory reset

If nothing else works, there might be malware on your phone causing trouble. It’s crucial to eliminate this threat before further damage occurs. The recommended action is to perform a factory reset on your phone.

However, keep in mind that this process can result in data loss, so it’s essential to back up your data beforehand. Follow the steps to perform a factory reset on Android:

  • Step 1: Go to your Android Settings.
  • Step 2: Select Backup and Reset > Factory data reset. Then, opt to erase all data.

Perform a factory reset.

Most of the time, you won’t need to go to the extreme of a factory reset. The simpler solutions mentioned earlier should take care of the Security Certificate Error on your Android.

Conclusion

By now, you should have a good grasp of the “Your Connection Is Not Private” problem on Android. This issue typically arises from complications with the SSL certificate of the website, designed to ensure a secure connection.

When you see the error message, it often comes with specific codes that indicate the underlying problem. Several methods can be employed to fix the “Your Connection Is Not Private” on Android. Clearing the browser cache, repairing the Android system using tools like Dr.Fone, checking and fixing date and time settings, and performing a factory reset as a last resort are among the solutions.

By prioritizing user safety and following the step-by-step approach in this guide, you can navigate and resolve this common internet browsing challenge on your Oppo A18s.

Super Easy Ways To Deal with Oppo A18 Unresponsive Screen

The evolution of smartphones signifies the development of mobile communication technology. Different from the initial years, they are not just used for messaging and calling but have many other applications. Oppo A18 cell phones are presently utilized for perusing the Internet and exploring through maps, photography, videography, and numerous other used cases. A development in arranged availability goes hand-in-hand with the development of cell phones.

Oppo A18 smartphones are gaining popularity owing to their low costs, high quality, and innovative features. High-resolution cameras, extensive battery life, and lightning-fast processing are just a few of the advantages of these mobile devices. Nevertheless, customers may sometimes need help with issues, such as a non-functioning Oppo A18 touchscreen, which may be challenging.

Some common issues might arise for Oppo A18 phone users. The Redmi note 4 touch not working is a serious problem. It can only go up to the initialization screen. In this guide, you’ll find the information you need to troubleshoot and fix the most common problems reported by Motorola customers.

What causes a Oppo A18 Screen to be unresponsive?

The screen on your Oppo A18 phone could stop responding for several reasons. The touchscreen, the system software, or the hardware itself might all be at fault. To effectively address an issue, it is crucial to locate its origins.

The following are some potential reasons for an unresponsive screen on a Oppo A18 device, along with descriptions of each.

There are signs of soft bricking

A touch screen not working on Oppo A18 smartphones indicates a soft brick (recoverable by firmware update), often caused by a defective or undercharged battery. System file corruption, old firmware, or failed upgrades are all possible causes. Several customers have complained that after installing a software update, their Oppo A18 4 or 5 device’s screen became unresponsive and remained at the boot logo.

There might be issues with the Oppo A18 device itself

Screens on Oppo A18 devices may become unresponsive for a variety of hardware-related reasons. A broken LCD panel, faulty touch sensor, or loosened ribbon wires are all possible causes. Every Oppo A18 device, including the Note 4 and 5, is susceptible to these problems.

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There might be errors in the updated software

The Android operating system is adjustable. Some of our technological advancements may backfire on us. The phone won’t power on or become stuck in a boot loop where the logo will only show intermittently. For example, some Oppo A18 4 and 5 users have reported their screens are unresponsive after a software update, rendering the Oppo A18 device unusable.

The common solutions to solve a Oppo A18 Screen unresponsive

Could anything be more annoying than a broken touchscreen on your Oppo A18 phone? If this happens, the gadget is useless, and you won’t be able to do even the simplest tasks. Even so, it’s common for the screen to cease responding to touches.

Before taking the item in for repairs, see if you can figure out the problem independently. Do you want to learn the method? If the touch screens on your Oppo A18 stop working, don’t panic; we’ll teach you exactly what to do.

Solution 1: Try to restart your device

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restart your phone

Giving your Oppo A18 a restart is one of the most common solutions if you encounter an unresponsive screen on your phone. Here’s how.

Step 1: Press and hold the power button until the screen becomes black;

Step 2: After 1 minute or so, hold the power button again to power on the Oppo A18 device.

Solution 2: Check your charging port and battery

xiaomi battery and charger

If the battery of your Oppo A18 is empty, your screen is expected to be unresponsive. To fix that, here are some easy steps for you:

  1. Charge your phone.
  2. Leave it for about an hour.
  3. Come back to check. Turn your phone on.
  4. Test if the touchscreen is now working.

Solution 3: Contact Customer Service

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Let’s assume you’ve applied every possible course of action. For example, your Oppo A18 4 touchscreen is still unresponsive. You may contact the brand’s customer support department if you need assistance. When the time comes, they’ll always know what to do.

Based on the customer’s feedback, one of the frequent issues of the Oppo A18 is when the screen becomes unresponsive. These issues should not usually happen, but if you find yourself in this dilemma, a list of other solutions below will help you.

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Solution 4: Turning on your full screen option offered by MI

full screen options

Steps to activate full screen gestures

Step 1: Browse you setting

Step 2: Search for full screen display

Step 3: From here, tap the screenshot on the right with the toggle labeled Full screen gestures

This may include gestures to get used to but it will also fix when your touchscreen sometimes stops responding.

Solution 5: Backup and Factory Reset is always a choice

factory reset on android

Doing a factory reset may be your last remaining choice if the preceding solutions are unsuccessful. If you do this, all of the information on your phone will be deleted.

Easy Steps in Doing a Factory Reset

  1. Press the power button until the phone shuts down
  2. When your phone shuts down, press and hold the power buttonand Volume down button at the same time until the Android logo displays on the screen.
  3. Recovery Menuwill appear in your screen, press volume down button until Factory reset is highlighted
  4. Press thepower button in selecting the Factory reset option and your phone should restart automatically.

Solution 6: Using Dr. Fone Android Repair Toolkit

dr fone system repair

If you want to fix issues like this, most simply, Dr. Fone offers that. It is made to provide you with a complete mobile solution. You may have your phone fixed without losing any information. Dr. Fone’s many handy tools will quickly get your phone back in working order.

How to avoid a Oppo A18 screen unresponsive?

Users may take several precautions to avoid the Oppo A18 screen unresponsive problem. Stop using any app stores or other unofficial app providers. There is a risk that doing so may damage your device or introduce viruses that will force your phone to restart. There’s also a risk of losing important information like photos and files.

Regularly updating the Oppo A18 phone’s software is necessary to keep it running smoothly and free of issues. Tools like Dr. Fone allow users to periodically maintain and restore data by cleaning the cache and deleting unused applications.

Avoiding severe temperatures and humidity may protect the Oppo A18 device’s internal components and keep the screen responsive. Using high-quality charging cords is also recommended. For once, consumers won’t have to worry about breaking the screen because they accidentally dropped their cell phones. If users follow these measures, they may reduce the likelihood that their Oppo A18 smartphone will have an unresponsive screen.

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Conclusion

Sometimes, Oppo A18 smartphones may experience problems with their screen. This occurs if there is an issue with the functioning of a new app or a software update. Several Oppo A18 phone owners have reported problems with an unresponsive screen. However, the remedies outlined here should help you quickly and efficiently fix the issue and get your phone back up and running. Keep your phone updated, and remember to back up your data often to avoid this problem in the future.

When following the directions, the user may require more research into some troubleshooting techniques. If this is the case, Dr.Fone Repair is usually the solution. The fact that Dr. Fone can continually tweak his system of unresponsive screens is wonderful news. This helpful tool can fix both black screens and endless starting cycles. That’s why it’s an integral part of every modern computer.


  • Title: Cellular Network Not Available for Voice Calls On Oppo A18 | Dr.fone
  • Author: Ariadne
  • Created at : 2024-07-30 10:01:18
  • Updated at : 2024-07-31 10:01:18
  • Link: https://howto.techidaily.com/cellular-network-not-available-for-voice-calls-on-oppo-a18-drfone-by-drfone-fix-android-problems-fix-android-problems/
  • License: This work is licensed under CC BY-NC-SA 4.0.
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