Volvo FM Globetrotter USB port

Hi all.
At the beginning of December I shall be getting the above truck, in Tridem form.
It’s not the new shape one.
I’ve driven these and the FH’s and know that when I plug my iphone 5 into the USB port on the dash, all I get is “USB unsupported”
My question is, is there a way round this, is it only iPhones that are the problem??

Cheers in advance

Ginge.

Btw, I mean so I can listen to music rather than charging!!

you need one of these http://www.poundland.co.uk/signalex-stereo-jack-cable-2m