Originally Posted by maxjakob
We're both in Germany.
Posted via BlackBerryForums.com Mobile
I suspect, at this point that there is an issue with one or both of your providers as they are both MVNOs (Mobile virtual network operator - Wikipedia, the free encyclopedia
). I know Congstar utilises Telekom, but I'm not sure who 1&1 uses. The bottom line is that there are way more points of failure when an MVNO is in use.
The other possibility is your mate's Android device. If he has the time, have him go to the phone app and enter *#*#4636 and verify that +49 171 076 0000 is set as the SMS service center.