Call Timer

I've got a VX4400 and its got the call timer feature. It's pretty handy to see how many minutes I've used but the one bad thing is that I want to reset it but don't know how. I want to see how many minutes i've used this billing cylce but it shows minutes total, ever since i got the phone. What should I do to reset the call timer?

anyone have any ideas?

you go to menu where you saw life timer. then you will see home calls & roam calls each one when you open it up wii have a reset button.