T-Mobile web"n"walk Stick Fusion III. Data network: EDGE, GPRS, HSDPA, HSUPA, UMTS bands supported: 850, 1900, 2100 MHz, GSM bands supported: 850, 900, 1800, 1900 MHz. Operating frequency: 850/900/1800/1900 MHz. Colour of product: Black. Width: 26 mm, Depth: 68 mm, Height: 12.3 mm. Compatible operating systems: Windows 7 Windows Vista Windows XP SP1+ Mac OS X 10.6.x, 10.5.x, 10.4.9 (Snow Leopard, Tiger)