My friend has a problem using his micro-SIM card on his new Sony Xperia Z (Android 4.1.2)
The problem is: when he inserts the SIM card, the phone display a message that the SIM card has been inserted, and restarts... then after the restart, displays 'SIM card removed' and restarts!
Notes:
1-The SIM card works perfectly on other phones.
2-The shop where he bought the phone has installed apps (mostly games) before he received it.
Any solutions?