our company already eatablished for 6years.and we have oem products and brand products.1)Chipset:Qualcomm MSM6290 2)Band: GSM/GPRS/EDGE:850/900/1800/1900 MHz UMTS :850/1900/2100MHz 3)Support System: Win2000/ XP/VISTA Win 7 32/64 . Mac OS.Linux android 4)DL: 7.2MBPS, UL: 5.76MBPS