BackHow to turn airplane mode on and off on my HTC One M9 — Step 1/6
"Flight mode" turns off the phone's wireless signals for safe use in airplanes and other areas where radio transmitters aren't allowed.
BackHow to turn airplane mode on and off on my HTC One M9 — Step 4/6
Back Touch the Airplane mode slider.
BackHow to turn airplane mode on and off on my HTC One M9 — Step 6/6
Back Flight mode is on. Touch the Airplane mode slider again to turn it off.