If an unlocked iPhone is jailbroken and restored, is it re locked?

I'm gonna buy an iPhone from someone and he says he took it somewhere to get it unlocked. He said it's jailbroken, but if I want he can reset it. I don't want it jailbroken because I want to be able to update it. If he resets it, will it be relocked?

Depends on the unlock he had done.

If it had a software unlocked, like one via ultrasn0w then yes it will re-lock.
If it was via a factory unlock, then it would be fine.

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