I have nextel service through work.  They gave us real cheap phones.  I bought a 8330 Blackberry on ebay from a seller that told me it was a nextel.  I thought I could just put in my sim card and use it as a phone and thought it had wi-fi.  The phone is through sprint that doesn't use sim cards.  Is there anything I can do to be able to use this phone or do I need to sell it.  I don't think it's ever been used. Has the origional box, cd, phone with plastic covers, battery, instructions, head phones, case and memory card. It is in perfect condition with no blemishes at all.  HELP!  Thanks Strats