Make sure if it's a SIM card problem
If restart the mobile phone, re-insert the SIM card and other steps are useless. Just find your friend's phone card and put it in your cell phone. If you can read it, it is the card is broken; you need to go to the business hall to make up the card.
Power cycle your phone
In most cases, power cycling or rebooting the phone takes care of this issue. Rebooting of the phone re-launches the OS and the programs. If the SIM card is not getting detected due to some software issue, restarting may take care of it pretty easily. It will also try to re-establish the connection with the network, and while doing so will start the fresh search for the SIM card.
- Press and hold the power button until the reboot menu appears. It will look something like this picture.
- Tap ‘Reboot' or ‘Restart' depending upon your phone.
- Confirm that you wish to restart on the next screen.
- Wait for the phone to power up again.
Even if restarting does not take care of the problem, try another solution.
Confirm if the mobile phone is malfunctioning
Put your phone card in your friend's cell phone and try it. If it can be read, it may be that the cell phone card slot is damaged, or it may be that the cell phone system has problems. Don't rush to the repair shop; try the following methods to see if it can be solved.
Change the network mode
Although rare, the users sometimes end up choosing the wrong network provider, resulting in the SIM card issue. To take care of this problem, change the network mode to auto. Here is how you can do that:
- Open the Settings menu on your phone.
- Now, you will need to look for the section related to Mobile Networks. Different phones have different labels for it. Usually, you can find it under Connections or Networks.
- It will read something like 'SIM cards & mobile networks'; tap on it.
- Now you will see something like 'Network Mode' or 'Preferred network type'. tap on it.
- You will see many options, such as LET, CDMA, GSM, and more. Choose the one that is supported by your mobile carrier. If you are not sure, it is best to get in touch with the customer care of the mobile service provider. If your SIM was locked, just follow this article to SIM unlock your Android phone.
Upgrade mobile phone system
Go to the settings and see if the mobile system is the latest version. Try upgrading the version first. If it is invalid, please look down.
Restore factory settings
There is also a problem with the base-band (a BIOS specializing in communications) that the phone can't read SIM. If the mobile phone system is upgraded in peacetime and the baseband is not brushed properly, there will be bad signal or no SM card failure, and then you can restore the factory settings to try. Before restoring the factory settings, we can back up the important information of the mobile phone, such as address book, short message, photos, etc., in order to avoid the risk of data loss. After backup, you can go to the settings menu to restore the factory settings.
Mobile phone brush
Note that if you are a mobile phone enthusiast, you can download the "full package" of the corresponding model on Vivo's official website for brushing.
However, different types of brushers have different packages, and there may be differences in operation methods. Brushing machine has a certain risk. If you don't know much about it, go to the mobile phone after-sales for maintenance or system cleaning.
Fix the SIM slot, reinsert the SIM card
Some of the problems with the SIM slot that can cause this problem:
- SIM Card not inserted properly.
- Loose SIM slot resulting in the card losing the connection with the reader of the device.
- Accumulation of dust over the slot and SIM card reader making the slot incapable of reading the card properly.
To take care of the above-mentioned issues, here is what you can do:
- Turn the phone off, open the lid on the back of the smartphone.
- Take off the battery to expose the SIM card slot (some phones do not have the SIM slot blocked by the battery, so you may not need to remove it.)
- Take out the SIM and clean the slot with a dry cloth or brush to remove dirt and grime.
- Reinsert the SIM
If the SIM slot is loose:
- If you feel that the SIM is coming out or slipping in too easily, the slot may be loose.
- Apply some pressure to the slot.
- Check again if the slot is holding the SIM properly.
- If you are convinced, put the battery back on, and restart the phone.
Note: Do not apply excess pressure on the slot as it may cause permanent damage. If you are not able to fix it, take the phone to the store. If you deleted the data saved in your SIM card, like photos or messages, don't panic, there still a chance to retrieve deleted contacts and recover messages from your phone.
Toggle the airplane mode
If rebooting the phone or reinserting the card does not resolve the issue, it is likely that there is nothing wrong with your SIM card slot. If the SIM card is working on any other phone, it is also apparent that there is nothing with the card too. Sometimes, toggling with the airplane mode takes care of the problem. Here is how you can do that:
- Pull down the toggle/notification screen from the home screen of your phone.
- Locate the airplane mode, also called Flight mode in certain phones.
- Tap on the toggle to turn the Airplane mode on; confirm your action to enable the mode.
- Wait for a minute and then turn the Airplane mode back off.
Here are all tips you can apply when your phone has some problems with SIM card. After tried all the solution above and your phone still not read your SIM card, then you may need to your device to repair shop. Or if it is under warranty, visit the store in which you've purchased it, or your carrier.