Moto x won't charge or play music through car radio USB?

I bought a new radio about a year ago and it has a USB port. Since then I've had the iphone 4, iphone 5, and now the moto x. The two iphones would charge up as soon as I connected them to my radio via USB and even play Pandora through my car speakers.

But the radio will not read my Moto x at all nor will it even charge it. Any ideas?

and its not the charger. It's the same charger that came with the phone and I use it all the time in the house

does apple have some technology that android isn't using yet?

About 90% of USB equipped car stereo's only work with apple products. Android has changed its USB connector protocols so many times that many stereo companies just gave up trying to make compatible car stereos.

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