By default, my phone came with, "Ice Cream Sandwich" operating system, upgrade to "Jelly Beam" and suddenly I miss the phone recognize the SIM Card.
They tell me that maybe is that the IMEI is corrupted, because sometimes it works, sometimes not.
the phone is full, it works fine, only that detail, which sometimes fails to recognize the SIM Card.
I have been verified, but they tell me they do not have to verify this type of cell as that model is exclusive to AT & T (USA). I live in Panama and would like to re-use that phone.