Some customers have reported that when using an iPhone 6 or 6+ in the Smartphone cradle, the cradle puts the phone in sleep mode or turns the volume down (depending on which way the phone is oriented in the cradle).

This is due to the fact that the iPhone 6 and 6+ have buttons on both sides of the device, and the Smartphone cradle puts pressure on these buttons. To alleviate this issue, place the soft side of a piece of Velcro in the bottom slot of the cradle before placing your phone in it.