pippens there is no way you could undertake a project of that scale with your current knowledge. This isn't basic electronics that's full blown complex system integration from nothing. The sim cards themselves are nothing more that stupid memory chips that contain the identification numbers that the cell phone needs to access the providers network.
I don't understand the purpose of your project though, you'll have to have a cell phone in the car to make the all no matter what, it'll either be a module like the one transistor linked which will have to be integrated with hardware and software into the car, and even then you'll still have to swap the sim card in and out, two cell phones can't be using the same sim card at the same time, the provider will disable the account, it's called cell cloning and it's very easy for the provider to detect, so you would need a seperate cell phoen in the first place. That being the case all you have to do is wire a car charge directly to the cars electrical system so that the cell phone charges whenever the car is turned on and put the cell phone and it's antenna someplace out of the way where it can still get signal, then you just leave the bluetooth on and you're all set.