This is my first post!

I'm completely new to this and hoping that someone might be able to point me in the right direction.

I have an Idea for a product to send some phone information (callerid etc) to a small screen via bluetooth. Kind of like the Nokia 616 and 610 Car Kits.

I note that the kits mentioned above are compatible with a very limited number of phones.

Is there any scope to make a device like this compatible with most if not all BT phones for the tranfer of basic phone functions and contact data?

Where do I start and what basic information do I need in order to create such a device?