Using every possible combination - reinstalling MyDrive App,, resetting TT Unit, connecting with Bluetooth to TT, Logging out and signing into my account, Pairing with unit and always able to show that unit is connected at every possible step. Problem - iPhone App MyDrive in Bluetooth mode will not send distination to TT. When phone is connected to Wi-Fi in my house(and driveway) and outside my work office, connection to TT perfectly and able to send destination. When phone is not connected to WiFi the ability to send destination to TT will not work. Enabling phone hotspot works o.k. too but I don't want to exceed my service plan hotspot limit.