Law and data protection
TKG
Abbreviation for Telekommunikationsgesetz
In short and in plain language
The TKG is a German law on phone and internet services.
It has rules for the firms that offer these services and protects their customers.
It also covers which number is shown when someone calls.
What applies in your case is a matter for legal advice.
Definition
The TKG is the German Telecommunications Act. Among other things, it governs telephone and internet services, customer protection and technical requirements such as the display of caller numbers. What applies in an individual case is a matter for legal advice.