How do I make my iPhone able to get service on it
How do I make it chose a Mobile network carrier so I can have data
Question marked as
Look for / visit a carrier, take a subscription, postpaid or prepaid card.
Check whether the SIM card is suitable for your iPhone.
Hopefully you have an carrier unlocked iPhone.
See ->How to unlock your iPhone for use with a different carrier
How to unlock your iPhone for use with a different carrier - Apple Support
- Apple can't unlock your iPhone for use with a different carrier. Only your carrier can unlock your iPhone.