You need Python >= 3.7 and virtual env to run this.
Calling this scrpt on a device connected to the internet via a cellphone network of Deutsche Telekom (or a reseller of Deutsche Telekom), the script will output the traffic used as well as the traffic included:
> python3 datapass.py
Datennutzung:
Tarif: Dein Datenvolumen
Datenvolumen: 1,5 GB
Verbraucht: 861,28 kB (1%)
Can be found on GitHub
GNU AGPL v3
Fore more, see LICENSE