I’ve used Airtel since I bought the phone last year I switch to MTN but it keeps saying No service even though I reset the network settings. But the Airtel works immediately I switch back. The MTN works well in my iPhone XR
iPhone 15 Pro, iOS 17
maybe the phone is sim locked
How to unlock your iPhone for use with a different carrier - Apple Support
Is that possible if I bought it brand new ?
sure, many places sell mobile phones that are sim locked to a carrier, they would be cheaper but then the carrier expect to make they money by the calls and data and sms and services
Why won’t my MTN sim work on my iPhone 15pro
