Seeing “No SIM” or “Invalid SIM” on iPhone? Check your SIM card, restart, or update your carrier settings. Simple fixes often ...

Getting an invalid SIM on iPhone and don’t know what to do? Let me help you with some solutions that should fix the problem. Check out the details as you read further on this post. How would you ...

Reseat the SIM card Disconnecting the SIM card normally refreshes cellular configuration of a device. In some cases, this is enough to fix messaging or voice calling issues.

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

These 5 possible methods will help you to solve your Android phone's Connection problem or invalid MMI Code issue in a jiffy.

ADVERTISEMENT And when this happens, an invalid IMEI message is displayed on the sim registration logo, which makes it impossible to neither make nor receive calls.