Headunit compatible with iPhone 4

[micky045]

I'm looking for the above please.

I currently have a Pioneer DEH-something-or-other which is spot on to be honest. However when I try to plug in my iPhone 4 to play music via the USB port, it doesn't recognise it which is a bit of a pain. Can anyone recommend a headunit that would work with my iPhone, i'm not fussed about the whole bluetooth/handsfree malarkey, just really want to so I can play music from phone either by USB or 3mm jack.

Also I've only had the head-unit since March and is in mint condition, so if anyone is interested in buying it, i'd be willing to sell for £60.00 inc. delivery. I still have box, instructions, receipt etc so it would be like receiving a brand new stereo. I can take pics of it installed in my car if anyone is interested, just so they can get an idea of how it would look.

Cheers