Thank you guys. After all I ordered a Fido SIM from eBay, since their rate to Germany of $ 0.44 seems reasonable and after topping up $20 my friend can reach the poivy access number for just $ 0.20.
There's only one question left: Do I get it right, that the
"Unlimited incoming calls" tariff does only include incoming calls that originate from the same area code, so incoming calls from Germany would not be included?