Hi. Could anyone please HELP.
On serveral occasions I have repaired iPhone 4 screens, and when I have finished and reinstall the SIM card, the phone always switches from "searching" to "no service." I have performed hard resents and put the phone back to DFU mode but it doesn't help. I have been told it could be a hardware issue such as a fried base band chip. However, I have tried to switch motherboards but this does not work either. My question is what other hardware issues could be causing the SIM card not to work?
I am pretty desperate to resolve this issue as I have people depending on me. Much appreciated
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