I have a nokia 7610 which i have purchased a few months ago. Its in a very good condition. I have never dropped my cell phone any where nor have i ever threw or press my cell unknowingly. My problem is that, yesterday when i was working with my cell, the 4, 5, and 6 digit keys and calling key of my nokia mobile suddenly stopped working. I had switched my phone several times and tried again but again the result was the same. Although the remaining keys are working properly but cant find the solution for this. Can anyone help me out with this.