Problem with my htc phone

I would say your digitizer is going bad or has dead spot's. The digitizer's are quite cheap usually $9-15 but require a skilled technician for installation.

Scan your mobile for Viruses. and check the setup for the line access

i would go with your first idea. if youve got good phone insurance why tinker when they can fix it no problem. if not i think the phone mightve taked a few to many bumps in its year of life

In your profiles, hit Menu, then edit, then choose ring and vibrate. It might take a couple of tries because that is a known issue with the HTC Snap, Ozone and Sprint Hero. Reset your profiles to default and do this a few times. It gets a little tedious and annoying, but HTC hasn't fully addressed the issue yet.

Hi Nitin,
Select the network manually and try if other parties are able to reach you without any trouble.

if you momentarily push the "start" button, that should put the phone into hybernation. Which means the screen will go dark and quit using power. If the phone rings it will automatically wake up. If you want to use it just hit the start button again.

There are also some settings in the "settings" menu that determine when and for how long the screen stays illuminated when not in use.

:) Sometimes happens to me also. I faced a similar problem before, I think one of the installed programs on your device does it, I couldn't remember the name of the application now but whenever I launch it, my phone sound goes to minimum, Just to let you know. Have a nice day.

I think the issue is a misconception on the operation of the phone. The phone flashes for the first ring, vibrates for the second ring, and then rings for the 3rd and 4th ring before dropping to voicemail. it requires a registry modification as can be found on some forums to make it "ring immediately." If you put the phone on vibrate it will buzz immediately and skip the flashing lights step.

try installing this Hotfix
http://www.htc.com/us/SupportDownload.aspx?p_id=88&cat=0&dl_id=101

Hot fix for resolving ring tone and system sound loss problem in HTC Touch Date: 2008-08-28     Category: Hotfix 
In some cases, there may not be any ring tone and system sounds on the HTC Touch when the device has not been soft reset after a few weeks of usage. Performing a soft reset will resolve this problem. You can also download this hot fix and install it on your device to prevent this problem from reoccurring. 

It's a problem with your phone or the network. Take it back to the dealer and let them work it out.