The 3.5mm plug that connects your phone to your intercom audio does not have power - to charge your phone, you need an alternate power source. Charging your phone while playing music can cause a ground loop, adding noise into your headsets/helmet. To remove this ground loop, you will need to connect a Ground Loop Isolator in line with the phone cable. If your phone doesn't have a 3.5mm jack, (Apple Lightning) you will need an adapter separating the power and audio for 3.5mm.4)    Charging cable (Amazon for $10)