... Frequency:dual band900/1800MHz 3.Interface:DB 9 pin mc39i modem ,SMS/MMS/GPRS function ,advanced performance Specification : Cinterion GSM/GPRS ... CSD up to 14.4kbps, USSD, Interfaces: UART, RF connector, 40 pin system connector, SIM card interface, Keypad and LCD, etc.Accessorie GSM ... /GPRS antennas 40 pin ZIF system connector Flat cable for connector SIM card holder U.FL to SMA ...