This is the first phone featuring the Google Android operating system, and features a 3" 480x320 screen, GPS, BlueTooth, Wi-fi, 5 hour talk time, 130 hour standby time, microSDHC a 3.1mp camera, and various Google applications.
There are 2 price plans listed on their website for the phone.
Both plans are £40 / month for an 18month contract, and include a free G1, and web n' walk Plus.
They seem to differ on the texts/minutes combination:
Visit the T-Mobile website for details.