I have an iphone 5 ana i buy it unlocked and when i update the ios to 7.1 the iphone is locked .why?

i have an iphone 5 ana i buy it unlocked and when i update the ios to 7.1 the iphone is locked .why?

Probably because the previous owner had the phone hacked to unlock it, and when you updated it locked back to the original carrier.
Only the carrier that the phone is locked to is authorized to unlock it.
If the previous owner had the carrier unlock it, you wouldn't have any issues.

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