通過wvdial完成4G自動撥號上網

先安裝wvdial：

sudo apt-get install wvdial

wvdial需要一個撥號配置文件：

/etc/wvdial.conf

移動卡或者電信卡配置文件如下：

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0
Init3 = AT+CGDCONT=1,"IP","3gnet"
Modem Type = Analog Modem
Baud = 9600
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99#
Password = card
Username = card
Auto DNS = on

聯通卡配置文件如下：

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0
Init3 = at+cgdcont=1,"ip","uninet"
Modem Type = Analog Modem
Baud = 9600
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99#
Password = card
Username = card

保存後退出，後臺執行wvdial:

wvdial&