The SIM card inserted in this iPhone does not appear to be supported. Well I got an Iphone 3 awhile ago and it was working just fine, till I used Itunes to update the firmware, now I can't even speak for more than 5 mins because the phone would hang on, (emergency calls)... amazing apple.
I made the huge mistake of supporting apple and they blocked the possibility of continuing using it... The thing is that precious data is in the phone and I'm looking for a way to unlock the device and use it.
I tried by downgrading to an older version, but is not working. Please could anyone help me, what can I do?

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