"No Service", "No SIM", or signal that comes and goes.
A damaged SIM tray or reader, a loose antenna after a drop, or a board fault.
We test with another SIM, check the antennas and reader, and repair the board if needed.
It depends on the model and on what we find inside, so we quote each repair individually. The diagnosis fee depends on the device, and you approve the exact repair price before any repair starts. If it can't be fixed, you only pay the diagnosis.