Fixes for sim errors are not specified –
Restart the device.
The first and most common way that a person will try to resolve any problem is to restart the device to fix minor bugs and errors. This will solve the problem with the SIM card.
Clean the SIM card and SIM ports.
The next step is to clean the SIM card and the SIM ports where the SIM card is inserted and then try to insert the SIM card again and see if your issue is resolved.
Install operator settings.
Users should first go to their Device Settings app and then go to the Phone section.
Under the phone section you should find the option to update your profile.
When you update the system after you click Update Profile.
Flight mode is active.
Once you can switch to airplane mode, you can update your network and activate the used SIM card to use.
Contact your SIM card provider.
If none of the above options work for you, contact your SIM card provider. You should contact your SIM card provider to fix any problems and be able to find the right solution to fix your unique MM2 SIM card.