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In mine there is a sync cable input device, its in the center console towards the shifter by the extra cigarette lighter. You have to have the cable in order for it to work though but they can be picked up at just about any electronics store for pretty cheap.
i may be wrong but i think in some of the older mustangs they have the cables in the glove box. id check but i could be wrong so dont take my word for it
I know in the 2004 with the prem sound, it's a piece you have to buy (costs 160, I think) but the radio is already capable of it. It just doesn't have the hardware.
If you don't see a jack anywhere but you have the AUX on your radio (or the six cd) it should be able to do it, but you'll need to buy an attachment and have it installed (or do it yourself.)