Which SIM to receive calls while travelling and just keep number alive?

[andy]

Originally Posted by inquisitor

Now this is where the German regulator says that it would be unfair to charge high mobile termination rates but then terminate the call into the Internet because the MNO would have a huge unjustified margin.
That's why simquadrat only terminates calls to the fixed number to VoIP clients but not those to the mobile number. Hence you cannot use VoIP to receive calls free of charge even abroad and without any temporal limitations.
I hope I was able to make this more clear now.

Interesting. I assume that might hamper O2 launching TuGo in Germany

Yet paradoxically if I get a German data SIM which supports VoIP I might receive calls on an O2 UK number free of charge while visiting there.