Hello all. I work for eXpansys USA and can confirm this is tri-band GSM, 900/1800/1900. I have used one with both an AT&T and T-Mobile sim and it only worked with the T-Mobile sim as AT&T uses 850mhz in my market. You can check out the proper specs here, http://www.expansys-usa.com/d.aspx?i=174335
“Measuring 21.5 inches each, with 1920 x 1080 resolution, 1,000:1 contrast ratio, and optical multitouch technology under their chunky bezels, these two models represent the biggest mainstream push for touchscreen computing yet.”
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Hello all. I work for eXpansys USA and can confirm this is tri-band GSM, 900/1800/1900. I have used one with both an AT&T and T-Mobile sim and it only worked with the T-Mobile sim as AT&T uses 850mhz in my market. You can check out the proper specs here, http://www.expansys-usa.com/d.aspx?i=174335