Idem but I've changed the rom too.I did a hard reset, those numbers have to be stored somewhere in the phone and without knowing where i cant see any other way of making sure it doesnt keep happening.
It didnt happen again last night so hopefully problem solved.
this night my diamond called four foreign numbers also. i installed anti terrorist game yesterday. after start it completely crashed, so i should restart pda. i saw the game in the list above. maybe this soft can be dialer? iam from czech republic, diamond rom is htc genuine.