Update unlocked iPhone 4 to new iOS?

My girlfriend is getting an iPhone 4 from Ebay that is unlocked so it can work with her StraightTalk SIM. She wants to update to iOS 7 when it comes out Monday. We won't know till tomorrow if it was done by a 3rd party or legally through the carrier. If it was by 3rd party, can we still update the IOS version without losing the unlock?

Depends on what 3rd party solution was used. Something like ultrasn0w would break it for sure.

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