Uhm, I took a look at my details and there's something wrong and strange...
Do you understand the difference between a "phone call" and an "outgoing call"?
And I don't remember I made a 20" call, while I surely remember the "busy line" calling myself just after...
The "phone call" seems to be to (or from?) my home number, which is actually the only number I called in these days. Probably in the detail they show you the roaming price (outgoing call) plus the rate for calling an Italian landline, but that is just an idea...
And there seems to be no incoming calls, which actually I never received (since if I call my Yackie number I only get tritonal sound...)