A:AnswerYes, you must use the USB port on this model. Some others are wireless. I used a 1M USB extension to flat panel mount cable. It replaced the cigarette lighter. I then have to use a lighting to USB A cable. I also connected the MIC. I would say the Apple Carplay works well on this stereo.
A:AnswerUsing the most up-to-date firmware, 08.02.19,, NO. The Kenwood DDX5706S does not support wireless CarPlay.
I would be surprised if there any further updates at all and extremely surprised if wireless CarPlay gets enabled.