Hello!

I got some virus in mobile and I cannot remove it.
I tried to remove all programs and restore factory defaults but it is still there. I tried with f-secure mobile antivirus but it found nothing.
I cannot use it for calling each call cost to much and all money on it just gone in few seconds.
It is Nokia N72. And I also did upgrade it to leatest version.
I thought that it was something else that did it before but it is some stealth virus in it.
What must I have to remove it and what must I do?

Thank you for any help you can give.