No cell service but wifi and bluetooth fine. How to diagnose?
I have a damaged iphone 12 mini I’m trying to repair. It had been dropped and both front screen and rear glass were cracked. I have swapped the chassis and a fitted a new aftermarket screen. All seems to work except I get no cell service (no signal bars, no identification of msisdn in settings, and nothing helpful in field service mode). Wifi, gps and bluetooth are fine and the phone detects when the sim is present or not. The sim works fine in another iphone. Any suggestions on diagnosing if this is an antenna issue, a main board fault, or something else?
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