German TV channels can be watched in different ways via live TV services on mobile devices. Here are some possibilities:

Streaming Services: There are many streaming services that offer live TV options for German TV channels. These include Zattoo, Magine TV, Joyn and TV Spielfilm Live. These services often offer free trials before offering subscriptions.

TV Apps: Many German TV stations have their own mobile apps that allow users to stream their live shows. Some of these apps are ARD Mediathek, ZDF Mediathek, RTL Now and ProSieben.

Cable or Satellite Provider Apps: If you're an existing subscriber with a cable or satellite provider, you may be able to download their mobile apps and stream German TV channels.

IPTV Services: IPTV stands for Internet Protocol Television and allows users to receive television channels over the Internet. For example, some IPTV services that German TV channels offer are Vodafone GigaTV and Telekom Entertain TV.

It is important to note that many of these services may require subscriptions and in some cases geographical restrictions may apply. Also, a reliable and fast internet connection is required for streaming live TV shows.