Let me add my five cents! I bought a Blackberry in perfect condition for $20.00 in a garage sale, almost new! I went to E-BAY and bought an unlocking code for $1.87. Got my SIM CARD from my carrier, pop it in, and I have been using my Blackie for the last three months an not a word from my carrier! Actually , the phone is now almost new since I got different new parts, lens, back cover.
There you go!