I’ve got it working through USB now using wvdial.
/etc/wvdial.conf
</s><i>
</i>[Dialer Vodafone]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+COPS=2
Init4 = AT+CGDCONT=1,"IP","internet"
Init5 = AT+COPS=0
Modem Type = USB Modem
Stupid Mode = 1
Auto Reconnect = off
Baud = 460800
New PPPD = yes
Modem = /dev/ttyACM0
ISDN = 0
Phone = *99#
Username = { }
Password = { }
<e>
/etc/ppp/peers/wvdial
</s><i>
</i>noauth
name wvdial
usepeerdns
defaultroute
replacedefaultroute
<e>
Then run wvdial Vodafone to create a ppp0 interface and connect with the MT. And we have a working connection!
Now I only want to know if it’s also possible without the USB cable.