For all of you who are wondering if this will ever come to your windows phone, the short answer is no. According to T-mobile the 1800Mhz band is only for use by iphones, so unless you can make you Windows Phone device look like a iPhone on there network, you are out of luck. This was sad news when I heard it so I went to Straight Talk.
Fellow Geek and Pilot
Nokia Lumia 820 Cyan Wireless Shell
Samsung Focus V1.3 running 7.10.8858.136 - Full unlock on Dynamics v2.0 (ceesheim)
Nokia 900 Cyan on Straight Talk- Stolen at Atlanta Airport
Samsung Focus Flash/Omnia W
Raspberry Pi B Model