AnnyWay Call - a Central European int'l SIM?
 

Rather accidentally, I found the following stuff: http://www.annywaycall.com/. It looks like a German SIM since there's a special pricing for Germany with free incoming - incoming calls elsewhere seem to be non-free, but rathe cheap. A Sunsim rebrand or so? Help desk is available under the Czech number. I have no time to look for more details now.

I think your guess will be correct

Annyway is a brand of Materna, the parent company of vistream as hrgajek more or less pointed out here the other day, and Materna is also a supplier of plenty of other services including ivr wap and sms to main networks in several countries

But perhaps you saw something different to me; just now that looks like a holding page and I can't find any links on it, but this might interest you too

http://call.annyway.pl/ - calls seem to be from 29c/min

Some other interesting info, like a list of their mvno customers - I looked at this page the other day, but didn't scroll to the bottom!

http://www.annyway.com/annyway/MVNO-...7b1e38d.0.html

Czech Republic
 

it looks like it has a +420 number "Czech Republic"