UK Sim are the better ones
 

Good Morning

I would only use a Three sim in the future. It has some reasons:

- I can use every month 12 GB of Data in over 50 Countrys worldwide!!

- I can call for 2 penny per minute! In Germany you will pay 9 cent per minute!

- It works in 60 Countrys worldwide and not only in the EU!!

http://www.three.co.uk/go-roam

Germany: https://www.blau.de/tarife/prepaid-tarife/

or https://www.otelo.de/files/2018-08/2...tabelle-LX.pdf

I will stay on Three!

I am using my Three sim since 4 Years in Germany I didn't got any problem with it.