Using a Cell Phone as a Theft Protection Device for a Car...

I think, it is possible.

That's a brilliant idea Raisur! It never came in my mind. Two problems may arise though-one, the battery charge as you just mentioned. Two, makinng sure it's not so hidden that obstructs network signals.No 1 problem can easily be addressed with a small, cheap(without much features) cellphone which retains charge for about 3 days. For no 2 problem, I think we've to be a little creative. Happy myLotting!

Oh very possible, I worked for sprint for a long time. They fix cell units to a charger in the trunk of many police plot vehicles. they place the vehicles in bad areas and wait for it to be stolen and track it with telenav. Its a great program actually, I also use it for my daughter on her phone, I dont often go tracking her down because I usually know where she is but incase she were kidnapped or something I would be able to track her right from my house. and you know kids always want the expensive up to date phones and criminals are most likely not going to just throw them out! And if they do atleast you have some idea where to look! It also has an awsome navigation program, I am not navigationally inclined so I love it!

I think that is quite possible. The only thing to consider is charging the phone. So maybe a line can be done which is somewhat hidden so it cannot be seen while it continuesly charge the phone.

We have an alarm and an immobiliser on our car,
I had never thought about using anything else as an alarm look a like on the car,
Great idea mon ami,