"Offline mode" in iOS disabling radios I want to put my iPhone on offline mode completely. That way no-one can find me using Cell Towers or GPS. I want to keep my phone on.

What is the best way for doing that?
Switching Airplane Mode on entirely disables the Wi-Fi, cellular and Bluetooth radios in your iPhone. To disable GPS as well, go to Settings &rarr; Privacy &rarr; Location Services and switch the toggle off.