Process of unlocking an iPhone?

So we went to unlock our iPhone 4S for $20, and they told me to bring the phone back when they call so they can activate it and stuff. I just tried putting in my sim and somehow it works. Did the unlock happen wirelessly? Like is that even possible? Or was my phone already unlocked in the first place

(I tried putting in the sim a couple days ago and it didn't work)

Not at all, your phone may have been having a malfunction in it to where the phone is saying "hey, I'm missing something, I'm shutting down, I need that back bro " from where you may have had it locked, with no SIM card and inserting it back in triggered it to reboot itself and solve the problem internally there for tricking its self.

Yes, it did work. You are fine now. Just sync it in itunes if you haven't done so.

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