Updating iphone after unlocking

[hockeydude12]

If I unlock my iphone for t-mobile, then switch over to AT&T in June, will I be able to restore and update my phone without it being bricked?

 

[Tallest Skil]

You can always restore firmware to the original state. Upgrading when unlocked will relock your iPhone.

 

[hockeydude12]

So if you unlock the phone and then restore it, is the warranty still void?

 

[EHUnlucky7x9@ao]

So if you unlock the phone and then restore it, is the warranty still void?

No