Why won't my iphone 4 hook up to my jvc kw-nx 7000?

I have an in dash JVC kw-nx 7000 head unit… It hooks up to my usb flash drive and ipod touch plays from that
but for some reason it will NOT hook up to my iphone 4… I do not like playing music from a flash drive because it takes too long to load and the quality isn't too great but i can deal with it
so will someone please help me figure out what i need or what is going on… Thanks!

The unit is older than the iphone 4 and has no firmware updates to include ihpone 4 support so your out of luck. Either buy a new head unit or purchase a small portable usb powered hard drive and format it in fat32 and load it with mp3's ripped at 320kbps (best mp3 sound quality).

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