Contact service it is login contact service

Contact service is displayed on Nokia handsets if there is a critical software issue...

It can either be caused by damage to the software through flashing and other software related stuff, :)

or it can be caused by hardware damage to the handsets memory.

If its just the software then it would have to be flashed using proper equipment, if that doesnt resolve the issue then the hardware would have to be looked at and then the software flashed again...

Im afraid this isnt really a do it at home job, it does require equipment...