When I try to make or answer a call using my IPhone 6s paired to the Zumo 550, and the!Zumo paired to the Sena 10s I can hear the caller but they cannot hear me. I can hear the Zumo 550, the Sirius, FM and my iPod through the RT's Bluetooth to the Sena. My $20 LG Android Trackphone works just fine. I got the pay as you go phone in despriation prior to a three week camping trip. Any help would be greatly appreciated. Thanks.