I am looking into getting a Nexus S off ebay. I know it's not the newest or than high end, but I will probably get the newest nexus phone when it comes out and this will probably be temporary. The thing is, an unlocked one is over $100, and a Sprint one is about $50. I was wondering if I got the Sprint one would I be able to use it on Virgin Mobile or Boost Mobile? They are on Sprint's network so I thought it is probably possible.