Frozen & Blacked out screen

I bought my iphone around January last year, i've been having problems with it really since the first three months. I haven't really 'bothered' to do anything about the problems i've encounted because of sheer laziness (bad on my part i know) however it has now become beyond irritating.
the problems are:
1) when calling the phone freezes, the screen blacks out, meaning i am unable to cancel the call.. which results in most of my friends and family having very long answer machine messages, funny at first but bloody annoying. i cannot bring it back to the main screen unless i reset, sometimes it flashes back but the screen doesnt appear to register my touch.
2) i'm not sure if my screen is extra sensitive or (lol) i hold my phone to close against my face, i endlessy put people on hold or call other people in my phone book. i'm not sure if its my cheek or the actual iphone?
I havent ever restored my iphone
i do not have excessive amounts of photos/apps/dodgy apps
and i do not have any songs/videos on it either.
Thank you for reading.

Your iPhone's proximity sensor is not working, either because it has malfunctioned or you are using a case that blocks the sensor. If you have a case, remove it and try your phone.
Here are the sensors or the iPhone 3G/3GS.
Cases designed for the original iPhone will block these sensors.

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