Factory unlocked iPhone 4 now locked!!

Hey guys,
I bought this iphone 4 from uk, its a 32gb white factory unlocked iphone. MC606B. When i bought it there was no cydia or anyother app that suggested that it wud be a locked piece. I brought it to india and it worked fine. I just updated my iphone 4 from 4.3.3 to ios 5 and now it says that the sim card inserted in this phone does not appear to be supported!!! the error msg says SIM_LOCKED.
Is it possible for it to get locked again.
As far as i know all the MC606B builds r factory unlocked.
Plz help
what can i do about it??

Where in the UK did you purchase it?
The model number is NOT a reliable indicator of the carrier lock status.
If you did not purchase it from a corporate Apple Store, then it was probably hacked, not factory unlocked.

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    AT&T
    MC918LL/A - 16GB Black
    MC919LL/A - 32GB Black
    MD269LL/A - 64GB Black
    MC920LL/A - 16GB White
    MC921LL/A - 32GB White
    MD271LL/A - 64GB White
    Sprint
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    MD379LL/A - 32GB Black
    MD381LL/A - 64GB Black
    MD378LL/A - 16GB White
    MD380LL/A - 32GB White
    MD382LL/A - 64GB White
    Verizon
    MD276LL/A - 16GB Black
    MD278LL/A - 32GB Black
    MD280LL/A - 64GB Black
    MD277LL/A - 16GB White
    MD279LL/A - 32GB White
    MD281LL/A - 64GB white
    Factory Unlocked
    UK
    MD235B/A - 16GB Black
    MD242B/A - 32GB Black
    MD258B/A - 64GB Black
    MD239B/A - 16GB White
    MD245B/A - 32GB White
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    AU
    MD234X/A - 16GB Black
    MD241X/A - 32GB Black
    MD257X/A - 64GB Black
    MD237X/A - 16GB White
    MD244X/A - 32GB White
    MD260X/A - 64GB white
    France
    MD235F/A - 16GB Black
    MD242F/A - 32GB Black
    MD258F/A - 64GB Black
    MD239F/A - 16GB White
    MD245F/A - 32GB White
    MD261F/A - 64GB white
    Canada
    MD234C/A - 16GB Black
    MD241C/A - 32GB Black
    MD257C/A - 64GB Black
    MD237C/A - 16GB White
    MD244C/A - 32GB White
    MD260C/A - 64GB white
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    USA Factory Unlocked:
    MD234LL/A 16GB Black
    MD237LL/A 16GB White
    MD241LL/A 32GB Black
    MD244LL/A 32GB White
    MD257LL/A 64GB Black
    MD260LL/A 64GB White
    USA AT&T Locked (Carrier authorized unlocked if purchased "device only" or "contract free" from Apple store; paid full price)
    MC918LL/A 16GB Black
    MC920LL/A 16GB White
    MC919LL/A 32GB Black
    MC921LL/A 32GB White
    MD269LL/A 64GB Black
    MD271LL/A 64GB White

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