How much does it cost to "unlock" a phone?

Question

I'm considering buying a sidekick from a friend, and I was wondering how much it costs to unlock it? And would I go to a t-mobile store to unlock the phone, or to my current service carrier(cingular)?

Answer 1

Try this site http://www.superunlockcodes.com/unlock-your-phone/rs12wp2/  to unlock your mobile at cheap cost...