I'm thinking of buying the nexus one, going unsubsidized, and getting the tmobile data plan with it which they say they offer for any smart phone for $39.99 a month. I then plan on using my gizmo and google voice accounts and make VOIP calls with the phone using SIPdroid. It seems like VOIP is allowed by tmobile's network. What do you guys think? I'm pretty sure this will work but was wondering what everyone else here thought.