The poor service I have ever used. I live in Friedrichshafen that is 60KM far away from Switzerland. I was using my mobile data and don't know at which time the signals switched to Sunrise (Network of Switzerland) and Premium Sim charged me 60 euros for that. I got the notification message the next day that I'm using my data outside of Germany. How un-professional this is. When I called, I was told that is my problem and my mistake. Even though I am living inside Germany, still they charged me twice 60 euros for using my data outside of Germany. They have no solution for this and I am sure they are doing this deliberately.
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