For tethering to work with a SCH305-BT, the ComHub needs to be set up into Channel Mode: Set up for 2 Channels. This is not needed when you are only using the SCH305 ComHub version. Reason for this, is the addition of the Bluetooth module in the SCH305-BT. You can tether with the SCH305-BT ComHub, but you cannot access the device which is Bluetooth paired to the SCH305-BT from the same channel as the tethered group. The tethered group will be on Channel 2 and the Bluetooth paired device is on Channel 1.