Huawei E3131S-2 on Ubuntu 12.04 with wvdial

It works out of the box with a plain wvdial after a small adjustment (need to erase the +FCLASS=0 part). It is detected as the following device (after the automatic mode switch):

ID 12d1:1506 Huawei Technologies Co., Ltd. E398 LTE/UMTS/GSM Modem/Networkcard

For the record, I paste the wvdial.conf configured for T-Mobile in Hungary:

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+CGDCONT=1,"IP","internet"
Modem = /dev/ttyUSB0
Username = wap
Password = wap
Modem Type = Analog Modem
Baud = 9600
New PPPD = yes
ISDN = 0
Phone = *99#
Stupid Mode = 1

Most of the settings are not crucial, but some of them depend on your carrier, like "Init3", "Username" and "Password", while "Modem" depends on your device.

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