将3G上网卡移植到arm板linux时，usb默认的是存储器模式，需要将其转换成上网卡模式才能拨号，usb-modeswitch提供该功能-Will migrate to 3G on the card when the arm board linux, usb memory mode is the default, you need to convert it into a card mode to dial-up, usb-modeswitch provide this functionali

3G上网卡的产品ID等信息，提供给usb_modeswitch工具转换串行模式用-3G modem product ID and other information available to the usb_modeswitch tool to convert serial mode with