When your phone shows a SIM card not inserted error, it’s either telling you that the SIM card doesn’t have secure contact with the slot or something in the phone system is preventing the SIM ...

If you suspect that the problem is not the SIM card but rather due to a complex system error, contact Samsung Support for other options and official recommendations.

To fix the issue, you’ll need to troubleshoot the SIM card itself, your phone’s software, and potentially network settings. Find the potential remedies for your “No SIM card” issue below.

Phone suddenly showing "No SIM" or "Invalid SIM"? Don't panic, there are a few quick checks that can get you reconnected fast.

How-To How to unlock an iPhone and use any SIM card Is your iPhone locked to a specific network or carrier? Here's how to break free and unlock your iPhone. .

You can't make calls if you get the "SIM not provisioned MM#2" error, but it's easy to fix.