Well , ive been reading alot of people (well those who still use windows mobile) have been enabling HTC's dialer to help save on memory . I for one am one of those . However , people have disliked that you cant have the screen off when in a call . Well i fixed it . Install the cab attatched and it should work for you again
Instructions:
You must have mortscript installed***
1. Download the cab
2. Copy it to your device
3. Run it using a file explorer and install to your DEVICE
4. Restart your phone
5. Make a call to ensure it works
6. Enjoy (: