December 2nd, 2011, 04:28 PM
Join Date: Dec 2011
Location: Toronto, Canada
Device(s): Samsung Galaxy S2
Android ver: 2.3.7 Rooted
Baseband ver: I9100XXKI3
Carrier: Not Provided
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Similar problem. Brand new SGS2 (mine is International version, Unlocked). Froze last week and wouldn't recognise SIM card after restart.
I upgraded the firmware a few weeks before, through Kies, to v2.3.5 (XWKI4). I'm pretty sure I was asked/forced to restart right after, though so the problem should have shown up right then, right?
Anyway, I'm still trying to figure out how all this stuff works (kernel vs. firmware, CSC, rooting, etc.) but I THINK the XWKI4 version actually LOCKED my phone to a provider (not sure which one) and that may be why my SIM is not being recognised.
My solution is to upgrade to a firmware version that will keep my phone UNLOCKED. I just don't know which firmware version and whhere to find it. So far, all I can find is the provider-specific ones like XWnnn, XXnnn, UGnnn, etc.
Any suggestions or pointers would be appreciated.