Hi
Check that you are following the instructions here:
Remove or switch the SIM card in your iPhone or iPad - Apple Support
Hi
Check that you are following the instructions here:
Remove or switch the SIM card in your iPhone or iPad - Apple Support
Hi
Check that you are following the instructions here:
Remove or switch the SIM card in your iPhone or iPad - Apple Support
Why not? What happens when you try to insert it?
Provide some details and someone may be able to help.
I removed my sim from my iPhone 7 and it will not now go back in.