About a week ago, grandfather's iPhone 5c recently started showing 'No Service' with ATT. Nothing account wise/billing has changed. No iOS upgrades of any sort. We've restarted the phone several times, DFU'd, and reset network settings. Occasionally, the phone will temporarily get service but loses after a few minutes. Other iPhones get service in this area and we've tried in several well serviced places.
We've contacted ATT and they don't see anything wrong on their end.
We've tried my wife's SIM (from iPhone SE) and the same thing happens. We've also tried grandpa's sim in wife's phone and that works fine.
We've also tested another iPhone 5c that also doesn't keep service.
Both on iOS 10.3.3 - I believe the highest person it can go.
Any thoughts on what could be causing this?
We've contacted ATT and they don't see anything wrong on their end.
We've tried my wife's SIM (from iPhone SE) and the same thing happens. We've also tried grandpa's sim in wife's phone and that works fine.
We've also tested another iPhone 5c that also doesn't keep service.
Both on iOS 10.3.3 - I believe the highest person it can go.
Any thoughts on what could be causing this?