i'm having problems with my HTC WILDFIRE, as i've said in the question, it's the lock out/time out screen, that is the problem, iv'e had this problem since owning the phone. i can't make calls on this phone, i can't recieve calls either because the screen tends to lock our/freeze when i'm calling on on a call to someone. iv'e changed the settings in display, iv'e set it to never turn the phone off, 30 seconds, 10 minutes, nothing works. iv'e tried personalising the phone as in saving pictures from my gallery to the home screen and the lock out screen, phone still freezes though, when the phone freezes, i have to flick and tilt the phone and press end call or the number pad to press 2 to listen to voicemails. the phone is an absolute nightmare to use. 

the only thing i'm yet to try is, calibrating the g-sensor, if i put the phone on a flat surface and use voicemail, the lock out screen doesn't come up but how can you make a call or talk on a phone, when it's on a flat surface. iv'e had the phone for six months and still haven't worked pit how to use it properly, personally i don't like the phone and i will never purchase a HTC again