龙尚 U9300C 7模 4G LTE （国内全网通）
接入linux系统会有4个串口
其中ttyUSB2 为AT指令口
ttyUSB1 为拨号上网口
wvdial 拨号入网参数
[Dialer Defaults] [Dialer ChinaTelecom] Modem = /dev/ttyUSB1 Baud = 115200 Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 Init3 = AT+CGDCONT=1,"IP","ctlte" Stupid Mode = 1 Modem Type = Analog Modem Phone = *99# Username = ctnet@mycdma.cn Password = vnet.mobi New PPPD = yes Dial Attempts = 0 [Dialer ChinaMobile] Modem = /dev/ttyUSB1 Baud = 115200 Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 Init3 = AT+CGDCONT=1,"IP","cmnet" Stupid Mode = 1 Modem Type = Analog Modem Phone = *98*1# Username = guest Password = guest New PPPD = yes Dial Attempts = 0 [Dialer ChinaUnicom] Modem = /dev/ttyUSB1 Baud = 115200 Init1 = ATZ Init2 = ATQ V1 E1 S0=0 &C1 &D2 +FCLASS=0 Init5 = AT+CGDCONT=1,"IP","3GNET" Stupid Mode = 1 Modem Type = Analog Modem Phone = *99# Username = 4gnet Password = 4gnet New PPPD = yes Dial Attempts = 0
原文：https://www.cnblogs.com/JiuHuan/p/10074131.html