Interface: USB type Convenient Plug & Play Support Voice, SMS & Micro SD card support up to 8GB Superior signal reception through Mobile Receive Diversity Handy & portable Support R-UIM &amo; ROM-UIM Supporting extra large phonebook CDMA2000 1x RTT / CDMA2000 1x EVDO Rev.A , 800MHz EVDO Rev. A data service of up to DL 3.1Mbps/UL 1.8Mbps Windows 2000/XP/Vista/7 and Mac