When your phone displays this error, you can't connect to your wireless carrier's network. This means you can't use your wireless data over 4G or 5G, and you can't make or receive calls.
You'll know your iPhone is having problems with your SIM card if it alerts you with an error message or carrier name and the signal bars/dots at the top of the screen are missing or have been replaced with messages like No SIM or Searching.
What to do when your iPhone shows 'No SIM'?
How to fix iPhone no SIM error
To fix the iPhone without SIM, try the following:
Remove and check iPhone SIM
You need to remove the SIM and check if the card or slot is dirty, the SIM is not out of place. If the SIM is out of place, put it back, then wait a few seconds, the SIM card not installed error will disappear and the usual bars and your carrier name will reappear at the top of the iPhone screen. If it is dirty, use a soft cloth and clean it.
Update iOS
Updating to a new iOS version can also help fix the phone showing No SIM.
Please check if there is a new version for the operating system running on your iPhone to update. Before doing this, please make sure your phone has enough battery and a stable Wifi connection so that the process is not interrupted or error.
Restart iPhone
Perhaps the simplest and most commonly used way to fix many problems including the No SIM display is to restart your device. You will be surprised at how many problems are solved by restarting.
Turn Airplane Mode On and Off
Turning Airplane Mode on and off can reset your iPhone's connection to the cellular network and may resolve the problem.
Check SIM again
Besides the problems caused by phone errors, another reason that makes the phone display No SIM is due to the SIM. The simplest way to check if your SIM is damaged or not is to insert a SIM card from another mobile phone that you know is working properly.
If the No SIM Card Installed warning disappears after inserting another SIM, your iPhone SIM is damaged.
Repair, warranty
If you have tried all the above methods but it does not work, then you need to contact Apple technical support for guidance and help. Do not try to fix it yourself or the situation will get worse.
Above is an article on what to do when your iPhone shows "No SIM". Hopefully this knowledge will help you.
Trung Temple
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