I use Sprint for my cell phone service provider. I've been looking into buying a phone not offered on the sprint.com site, but I have no idea which ones are supported or not. One in particular I've been interested in is the Nokia 5800 XpressMusic. Does anyone know if I can transfer this phone to my Sprint plan in place of my current phone, and can anyone lay some guidelines down for a way to easily know whether a certain phone is supported by Sprint or not?