Ok two things

The USB port on your radio is not just a simple power source.
It enables the phone to use the radio speakers
So plug into a USB power plug in you lighter socket
They are avail on eBay with a flat cable that will tuck under your console trim to the phone mount
I bought my mount from ProClip online they are not free but worth every dime
Get the right one for your phone and if you use a case they can fit that too
I have a life proof case on a 4s
And can position the phone horizontal or vetical