I don't know the model number of your Jensen stereo, but most lower end stereos do not have specific capabilities with the iPhone or the Android operating systems. In general, the USB port is used to connect a USB Flash drive with loaded MP3 music. If you get a large USB Flash drive, you can listen for days without hearing the same song twice.
If you really want to get the music directly from your phone, you can connect an 1/8 mini stereo jack from the phone's headphone jack to the stereo aux input instead of the USB input.
2007 Chevrolet Silverado 2500HD Duramax Diesel
2012 Cedar Creek 30RL
Full Timers Since October 2012