... /2100MHz Quad-band GSM/ EDGE 850/900/1800/1900MHz operation Data, SMS, MMS Tri-band UMTS HSDPA Modem - Huawei 1831Huawei original, 100 ... + Micro SD Card SlotTri-band UMTS 850/1900/2100MHzQuad-band GSM/ EDGE 850/900/1800/1900MHz operationData, SMS, MMS functionAccessing E ... : Windows 2000, Windows XP, Windows Vista and Mac Operating Systems Huawei 1831