... Zte MF691 4G usb modem specification usb modem, usb stick, usb dongle, usb modem sim card lock free, download driver usb wireless modem, hsdpa modem, driver hsdpa usb modem, 4g usb sim card modem The ZTE MF691 ... / UMTS (WCDMA) - 850/AWS(1700)/1900/2100MHz.2G GSM / GPRS / EDGE - 850/900/1800/1900 MHz Data SpeedDownload up to 21 ...