Yes, I had just the 3G data only unlimited plan on AT&T with a Blackberry (they don't allow this with an iPhone because of an agreement with Apple). I don't know about their VoIP rules.
Yes, I had just the 3G data only unlimited plan on AT&T with a Blackberry (they don't allow this with an iPhone because of an agreement with Apple). I don't know about their VoIP rules.