Install required packages and start/enable ModemManager
sudo pacman -S usbutils usb_modeswitch modemmanager mobile-broadband-provider-info wvdial
sudo systemctl enable ModemManager
sudo systemctl start ModemManager
Remove Pin from SIM card
sudo mmcli -i 0 --pin=XXXX --disable-pin
sudo mmcli -m 0 --simple-connect='apn=internet.eplus.de'
Create /etc/wvdial.conf
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
Modem = /dev/ttyACM0
Baud = 9600
[Dialer aldi]
Phone = *99#
Username = eplus
Password = gprs
Init3 = AT+CFUN=1
Stupid Mode = 1
Baud = 460800
Start wvdial and add routes
sudo wvdial aldi
# eventually you need to add a default route
sudo ip r a 0.0.0.0/0 via XX.XXX.XXX.XXX dev ppp0