No sim or... how it detect sim card?


Mar 25, 2022

1. There is a mi 3 phone with a symptom that does not see SIM - but all Sim-PIN are in place and removing back panel does not show that they are broken, as is typical in this device.

2. No sim tray. Therefore, it is not clear whether the slot is faulty or some contacts are simply not closed. I saw one "foot" at the left bottom of the slot, but it did not respond to pressing. Anyone who has tried or knows, plz tell me how the phone detects presents SIM card or not?

3. What does a GSM antenna look like? She's not in the plastic insert on top of the phone or the cover?

in general, need to understand what to repair! is the radio module dead ... (by the way, how to test?)