The French data plan even includes 25 GB of roaming which you can use in Germany...

kbwt on Dec 20, 2017 | parent | context | favorite | on: Google will turn on native ad-blocking in Chrome o...

The French data plan even includes 25 GB of roaming which you can use in Germany, IIRC you can choose between Telekom or Vodafone network. Unfortunately, you still have to be in France most of the time, or they will cancel your contract.