So i recently purchased a plan through Sprint and for free got a BB 8530 curve. Then tonight my dad shows up at my place with a new BB tour his work gave him through Verizon and gives me his old 8820 through At&t. Now obviously this phone is nicer then my curve so does anyone know if I can use it on Sprints network? Like i said as well i just got the plan so im locked into a 2 yr agreement and so far im satisfied. At&t also wanted a deposit off of me so canceling my current plan and swtiching to them with this phone probably isnt going to happen. So if i cannot use this phone on Sprint I will sell it. What are they typically going for?