I have some old Mobile Tel. Camera. Can i use this..?

hello

just make a key hole in your front door paste ur camera phone ( camera side facing outside ) on the door firmly now u can view who is come calling to your door step

if u want just click the phone to get a snap of their funny face

Try Make Magazine

What breed of phone is it? Google is your friend. I would suggest to search on something like: [manufacturer] [model] camera hack

Or open it up and find some numbers on the camera module itself, google those numbers in part or whole.