I'm pretty close to dumping AT&T and making use of my unlocked phone. I'm curious about others experiences with T-Mobile recently, especially if someone else has an iPhone on their network. I may aim for the $30 a month unlimited data and text plan, with 100 minutes. Just debating if that will be enough talk time each month. The other possibility on the talk side is to port my number to a VoIP service, but I worry about reliability of VoIP over wireless data networks and integration with the iPhone.

Coverage areas that interest me are around Austin and other parts of Texas, front range of Colorado, Seattle, Portland, and Orange County, CA. From what I can tell, most of these areas have had the frequency swap already occur to allow iPhones 3G (what T-Mobile brands 4G) access.