iPhone Sim not supported
I will try all things for sim updates an all but till now my iPhone not supported sim card
iPhone 11, 14
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Are you seeing any error messages such as Invalid SIM or No SIM?
Then the phone is most likely locked to a different carrier, you will need to contact that carrier and have them unlock your phone before you can use your SIM.
https://support.apple.com/en-us/HT201420