there are plenty of how-to's on this one.... try looking a bit harder [you may also want to check hackaday, I bet they ran something on it].
I've been looking for one of those classic "Brick" cell phones.... you know the ones I'm talking about.
I want to retrofit my RAZR into one of those [along with enough battery power so I only need to charge it once a year.... and maybe a car cigarette lighter]