Not able to make calls, H symbol not shown when the phone is in Pocket, screen lock

[varadharajan76]

1. Whenever I made call, first it got disconnected immediately. After 3 or 4 attempts only I could make any call.
2. Frequently the 3G connectivity lost. Then I had to tap Data enable (thru settings menu) to enable it.
3. I need to charge the handset too often (the battery not last for 3 hrs).