For some reason I can't use voice and data at the same time on my Nexus One on AT&T over 3G even while on wifi. Loved being able to do that with my iPhone. It's like being on Verizon and it sucks. Is that a problem with Android? Or just the Nexus One? I thought it might possibly be because there's no plan for the Nexus One (just using my iPhone's plan) so maybe for some reason AT&T won't give me voice and data at the same time? Would have to hear from any T-Mobile customers and see if they get simultaneous voice and data to confirm this.