About half an hour ago somebody called me at the phone, presumably from a english-speaking country (can't tell because the calling number was masked). For sure he wasn't any of my known foreign contacts. Unfortunately I couldn't understood much, since I was in an area with low signal strength and the audio quality was extremely low. Sorry for the inconvenience - now I'm back home and I see a full signal quality on my mobile - the unknown caller might retry, if he wants. :-)