If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad
1
Make sure that you have an active plan with your wireless carrier.
2
Restart your iPhone or iPad.
3
Check for a carrier settings update. ...
4
If your device has an eSIM, contact your carrier.
If you receive an alert that says Invalid SIM or No SIM Card installed, follow these steps.
1
Make sure you have an active plan with your wireless network provider.
2
Restart your iPhone or iPad.
3
Check for a network provider settings update. ...
4
If your device has an eSIM, contact your network provider.