How can I get Pandora to play via my Iphone4S thru my car radio?

I use an aux cord..

Many older cars don't have a port for an aux cord.

Another alternative is a mini-FM transmitter. Depending on how clogged the airwaves are in your area though, they can be more trouble than they are worth.

The best one I've ever had was this one, which is no longer in production.

http://tinyurl.com/7p86yng

• Have a look at this website. It has different case scenarios for different types of cars.
• http://techtips.salon.com/connect-iphone-play-car-stereo-3248.html