RCA Port in the back of non XM radio?

[suninmoon]

Hi

I'm looking to connect my iPhone 3G up to my factory radio in my 09 Nissan Sentra. My factory radio does not have XM and I was told in order to connect to the back of the radio I need an XM unit that has RCA ports on the back.

Would my current radio have RCA ports in the back? The only option I see now is the AUX port in the front of the radio. If not can I put an XM radio in my car just to get those ports. SAT radio would be nice but even if it doesn't work I really only want those ports for my iPhone.

Thanks

Joshua

[Bakerboard]

You can also go to a bestbuy or something and buy a sterio with a AUX port and have them install it. you pay for the sterio and like 100$ for the new dash kit and parts.