I've noticed that in order to use the iPhone 6 Plus as a mobile hotspot that I have to have Wi-Fi on on the phone. This doesn't make sense to me since mobile hotspot turns Wi-Fi off and uses the cellular network. Is there a way to broadcast the signal via Wi-Fi to other devices without turning Wi-Fi on on the iPhone? It's aggravating to have to turn off Wi-Fi every time I finish using mobile hotspot.