What car has a input to use iPhone music?

Like music they U personally download on you're phone to use in you're car like what kind of a car will do this?

Almost any car made in the last 5-8 years. And some even older.

Almost any car from 2008 and up will do it but that is not a problem
you can buy any car and add an iPod interface or USB Bluetooth to most vehicles,
or you can add auxiliary audio input to most vehicles from 1998 and up

http://www.oemautosound.com/c-3-car-auxiliary-adapter.aspx

I assume what you're asking is how to play music from your phone? You would do this by using a auxiliary plug which you can get pretty cheap from Walmart. The only thing is your car would need an auxiliary component. It's just a hole that should be around your radio. I personally have a 2012 Chevrolet Sonic and I have 2 auxiliary holes and a USB port. That is also another way of getting music in through the speakers of your car.

As for which cars, I'd say it is newer models in general that are starting to have these features. Older models cars still might even have an auxiliary component, I mean it's pretty much standard. Just when you are buying a car, make sure to check out the radio system. And ask the person helping you, they will know.

Bentley