Does updating to iOS 5.1.1 would lock my unlocked iPhone 4?

i have an already unlocked iPhone 4, i never upgraded my iPhone,so all am asking is,,,does updating to iOS 5.1.1 would lock my unlocked iPhone 4?
BTW,,, it is legally unlocked

Legally?
Here's the thing, only official unlocked iPhone done by the carrier the iPhone was locked to will never get locked again. So it your call.

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