How to Fix Oppo F1s SIM Card Issue

Fix Oppo F1s SIM Card Issue: Just like the various organs of your system work together to keep up your body going on, different parts of your device work together to make it work in some meaningful way. But what if one of them just slips off? Many a time you may have come across the “No SIM” error, especially in new phones. But your older phones are also prone to getting this error into themselves.

Whatever the reason may be minute or major, this problem can really make your day annoying if not treated ASAP. And recognizing you in a problem, we have here ensured to solve it by the means of 15 steps that could help you in fixing the SIM Card Issue.

What are the reasons for SIM Card Issue?

The reasons for issues in SIM card can vary from a mere SIM Card insertion problem to severe internal damage of the device. Most of the times, we insert the SIM Card in a way that is not compatible with the slot and end up in concluding a major SIM Card issue on your device.

Another mostly suspected issue is that although the SIM Card has been inserted properly, the problem lies with the Software. The device is not ready to read the SIM due to any sort of software corruption. This may show an inability of the device to check for the network of your SIM Card.

These are the most common reasons we could suspect for the SIM Card issues. Along with these and others, below are some hacks and tips you can try out to solve your issues-oriented to SIM Card in the Oppo F1s.

Some Features of Oppo F1s:

Oppo F1s

  • The Oppo F1s was launched on August 2016. 
  • The display type for this device is IPS LCD Capacitive Touchscreen with 16M colors and a size of 5.5 inches.
  • The resolution is of 720×1280 pixels and 16:9 ratio. It is a multi-touch screen.
  • The OS is Oppo F1s 5.1 Lollipop and is upgradable to 6.0 Marshmallow.
  • There is a micro SD Card slot with up to 256 GB and an internal memory of 64 GB and 4GB RAM.
  • The device contains Mediatek MT6755 or MTK7650 Chipset.
  • An Octa-core 1.5 GHz CPU and a Mali-T860MP2 GPU.
  • The Single camera comes with 13 MP, and 16 MP Selfie Camera has LED Flash, HDR, Panorama.
  • The battery is non-removable with Li-Po 30-75 mAh Battery with Gold, Gray  and Rose Gold colors and the price is about 20,000 INR.

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How to Fix SIM Card Issue on Oppo F1s?

How to Fix Android Devices SIM Card Issue

Here are 15 methods you can rely on to fix the SIM Card issues on Oppo F1s. Although we cannot assure you that all of these steps will work for your device and solve your problem but they can help you fix it in most of the cases.

1. Restart your Oppo F1s:

Believe it or not, Toggling the On and Off switch of your device can help you out with over 95% of the problems. This is the easiest and time-saving option to try in case your SIM card is not responding.

Giving it a shot will not take much time and who knows if it works for you too!

2. Toggle The Airplane Mode

Just like restarting your Phone could help, you can try toggling the flight mode so as to make your SIM Card work. Toggling the flight mode can give you results that you did not even think.

You can use this method when you know that the SIM Card is not the problem but the device has some issues. You can toggle the airplane mode by the following steps-

Step 1. Pull the Notification bar of your Oppo F1s down.

Step 2. Scroll slightly to the left of the notification bar till you find the Airplane Mode.

Step 3. Tap on the option of Airplane mode and thus you switch it on.

Step 4. A confirmation message will pop right after you hit that option to finalize your choice.

Step 5. Once you tap Ok on the confirmation message, wait for half a minute an then turn it off again.

This process should help.

Also See: How to unlock forgotten pattern lock in Oppo F1s

3. Put the SIM properly on the tray:

Sometimes in a hurry or carelessness, you put the SIM card inappropriately into the slot and this is what causes issues further. While putting the SIM Card in its slot, you must take care of how you are inserting it and has it been inserted properly or not.

A little pressure at the task can help but take care to not damage the SIM Card since it forms one delicate part. If the SIM is not staying at the place it should be, You can try putting either a piece of paper with or taping it from outside so it does not fall off its place.

4. Test the SIM

At times, the problem may lie with the SIM Card but you may think it to be your device’s fault. A better way to tackle this particular situation would be to check whether the SIM Card works or not on any other device of the same network provider. If the SIM works there, the problem resides in your Oppo F1s and if not, then the SIM Card is faulty.

5. Choose Appropriate Network Operator

Not selecting the appropriate network operator can be a reason that your device is not recognizing the SIM Card. In such cases, it is crucial to check that the network operator of your device is same as the carrier you are using. If you come to know that these two are different, try making the same by the methods given below-

Step 1. Go to the Settings, of your Oppo F1s.

Step 2. Now click on the More Networks option and head to the Mobile Networks.

Step 3. Tap on the Network Operators. Here, click on the option of Search Networks. This will initiate the search for the networks available and provide you a list of all the networks available on your screen. There, select the network carrier you are using i.e. the SIM Card. This will result in a proper connection between the device and the SIM Card.

Do Read: How to enter into Recovery mode on Oppo F1s

6. Select Auto Network Mode


The mode of the network on your Oppo F1s plays a vital role in supporting the network issues. If your network mode is not in the correct settings, you may face many problems, first being no recognition of your SIM Card on your device. Hence to deal with this issue, you will have to follow the steps below-

Fix Oppo F1s SIM Card Issue

Step 1. Go to the Settings of your Oppo F1s.

Step 2. In the connections section, search for More Networks.

Step 3. In this menu, select Mobile Networks.

Step 4. Then head to the Network Mode.

Step 5. A pop up will appear on the screen with options. From those, select the option- LTE /WCDMA/ GSM (Auto-Connect).

This ensures that your Oppo F1s will connect to the network available. If you select the wrong or any other option, there will be for sure one or other sort of SIM error.

7. Oppo F1s gets wet and shows “No SIM”

One of the worst case scenario your phone could get in. Dropping your phone mistakenly in water can instigate you to the highest levels of annoyance. If you ever go through this phase and because of it your phone shows you “No SIM” error, then the circuits of your SIM slot may have got damaged due to coming in contact with water.

You can resolve this issue by letting your Oppo F1s dry out completely. For this, take out the back cover of your device, if the removable battery, take that out as well along with the SIM Card and put these all items in a pouch of rice or in a soaking cloth.

Let the phone rest for one or two days and dry completely. After that take the items out and check if your phone works well. If still, the phone is not responding, it is high time you meet a professional.

8.Clear Oppo F1s Cache and Data on your Oppo F1s

A crammed junk may be the reason for not recognizing your SIM Card. You may have a question on how this is related. But as the different organs of our system work together to keep your body and metabolism going, the various parts of the phone keep it working.

Clearing the Oppo F1s Cache and data can help you with most of the problems and enhance a smoother experience on your Oppo F1s. For this purpose, you will have to head to the Settings> Storage> Internal Storage> Cached Data.

Tap on your last option from above and confirm with OK when a confirmation window pops up. By confirming this, all of your cached data will be deleted, including the app data. For some of the apps, you will be asked to log in first. The process may take a little longer but it will give better results.

If you wish to have a Cache Partition on your Oppo F1s, you will have to enter the Recovery Mode by using a combination of certain keys. This is specific for particular devices. It may change according to the device. When you enter the Recovery Mode, you will have to use the Volume Up and Volume Down buttons to navigate and Wipe the Cache Partition. When you are done with the process of cache partition you may notice a change.

Do not miss: How to check new software update on Oppo F1s

9. Manually Select APN and then APN protocol

Few of the settings of your Oppo F1s in the Cellular Network Settings may be a reason that your device is not recognizing the SIM. You must check if all the setting is reliable.

To manually select APN, you will have to head to the Settings> Mobile Networks> Access Point Names. Then Add APN Settings from your carrier’s website and select them. If the APN Protocol is set to IPV6you will have to change it to IPV4.

10. Reset Oppo F1s to Factory Setting

If even after trying out all the above options, your Oppo F1s does not recognize the SIM Card or shows any sort of errors while doing so, the advanced option at your hands is to reset your Oppo F1s to factory setting.

As you might know, after performing a factory reset, all of the data in your phone will be lost, all the third-party applications, all of the associated data too. The device will basically go back to how it came out of the factory.

Since you will lose all of your data, it is a recommended prerequisite that you have a back up of all of it. Only then and then head to the procedure of backing up your data.

Step 1. Go to the Settings of Oppo F1s.

Step 2. Search for the BackUp and Reset option and tap on it.

Step 3. Make sure to tap on backup and also the Automatic restore before having the factory reset.

Step 4. Once you are done with the above processes, tap on Reset Phone.

Also Have a look at: How to enable USB Debugging and developer option on Oppo F1s

11. Software Update Causing SIM Card Issue

Although the main motive of any software update is to ensure the better working, enhanced performance experience and higher safety to the device. However, at times, the older versions of a particular company are not capable enough to meet the higher demands and pace of these modified features.

And hence the effect is seen on the device at various tools and functions of it. Instead of the device being better at work, it becomes abysmal. At such times, the only option you have left at your hands is to roll back the update.

But before coming to any such bigger conclusion directly try the methods given above which are the 90% Cause of this problem. If you still fail to deduct the problem, and you made a recent update because of which you think the device is not reacting well and especially to the SIM Card, then rolling back the update is the only choice left to you.

For this Purpose, you will have to go to the Settings of Oppo F1s phone and reset your device to factory settings once you are done backing up the data. When you are done with this, check if the problem still persists. If not, you have got things right.

12. Update your Oppo F1s

If nothing else works and the update of your Oppo F1s is available, it is time you perform the update for it. Mostly the new settings, features, and stuff can help you with your current phone problems.

The question is how to check if an update is available for your Oppo F1s. For this purpose, you will need to check it through the settings of your device and make it if it is available. You can check for it from the- Settings> System Updates> Check for a System update.

If there is an update available, install it. And this may solve your many issues.

Do Check out: How to enter into Safe mode on Oppo F1s

13. Change the Place

Maybe the very reason your phone is not responding as it should to the SIM Card is that you are in a zone where there is no range at all. You can try checking if another device with the same network provider has a range for its SIM Card near you. If not then the problem lies with your Oppo F1s. But if the other device does not recognize SIM or has network issues at that particular place, you need not worry. Its because the place you are at has range problems.

14. Check for Null or corrupted IMEI and restore

The SIM and network problem of your Oppo F1s is highly related to your IMEI number. Check what the IMEI number of your Oppo F1s is. One method to do this by dialing *#06# on the dial pad of your device or you can also go to Settings> About Device.

If the IMEI number after checking through the above two ways shows as UNKNOWN, then it is a sign that your phone is the culprit and needs to be changed. Some IMEI numbers can also indicate if that is corrupt.

You can restore this by entering the Engineer Mode for which you will have to download any Engineer Mode app or simply dial *#*#3646633#*#*.

Note: This is quite a techie stuff and if you are not an advanced user of Oppo F1s, I recommend you to not perform the below steps or enter the Engineer Mode since this may put your device in any sort of risk. www.Oppo will not be responsible for whatever loss you face. If you want to, then perform the method at your own peril.

What you will have to do next is, navigate to the Connectivity Tab. There, Click on the CDS Information. Select the option of Radio Information. If your device is a dual SIM one, you see Phone 1 and Phone 2. Under Phone 1, insert the command:

AT +EGMR=1,7, "IMEI1"

then click on Send At Command.

under the Phone 2, insert the command given below.

AT +EGMR=1,10, "IMEI2"

Then Reboot your device.

Must Read: How to enter into fastboot mode on Oppo F1s

15. Uninstall Third Party Applications.

A Third Party Application may be a reason that your device is not working as it should. If you think that after installing a certain app, your device has got some issues, in this case, especially network issues, then it is time to check if that comes to be true.

You can know if any third party app is ruining your device by entering the Safe Mode in Oppo F1s. You can do so by pressing a certain combination of keys (Home Button, Volume Up, and Volume Down buttons and the Power Buttons depending on the device you are using.) Once you enter the Safe mode, you will see a tag at the left bottom of your device through which you will know that the device is in safe mode.

Run your device for a few hours in the safe mode and see if the problem is still persisting or gone. If the problem is still there, then the fault may be in your device. But if you do not encounter any issue then it was the third party application causing it.

Also See: How to Factory reset or Hard reset on Oppo F1s

Wrapping Up:

This was all you could do to fix the SIM Card related issues on Oppo F1s. I hope you guys found this article useful in Fixing your SIM Card related issues. The easiest to try is obviously toggling the flight mode of your device.

If that does not work well, there are many other options depending on the situation of your phone. A factory reset would be the least at your choices list, but it does work effectively to tackle the situation with your SIM. It would also eradicate any other problems with the device if you have any. And if even after trying all these methods, your problem still persists, it is high time you seek a professional for the purpose.

If you come across any difficulty or have any queries for us, do let us know in the comment section below. Also, keep visiting our page for more such articles or you can subscribe to our newsletter for receiving timely notifications of our posts.

Happy Androiding : )

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