Spec: Maio chip:Qualcomm（USA） MSM 6280 Support Band:HSDPA/UMTS/EDGE/GPRS/GSM Network speed:HSDPA:downlink 7.2Mbps, uplink3.6Mbps Can expand 4GB SD card memory,have SD lot Support USB (1.0 &highspeed 2.0) Drive: no need drive SMS Function with the tariff setting; Phonebook Function with a phone book function; System Support OS support: Win 2000, WinXP,Win2003，Vista Network: UMTS(HSDPA)/GSM/GPRS/EDGE GSM Band:850/900/1800/1900MHZ UMTS(HSDPA): UMTS 2100 MHz GPRS/EDGE MS Class 10 MCS1-MCS9 PPP stack/ Integrated TCP/IPstack