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I was close, I guessed 5 minutes.How long would you last were a helicopter drop you off at the top of Mt. Everest?
No surprises there.Why do airplanes fly so high?
Cell phone use is discussed on the video. Key elements of your comment is the word IF, And, then your question. My mind conceives towers on land that are not over the oceans unless they are on satellites.If cell phone signals are horizontal leaving the plane, and the towers are set downward to pick up signals on the ground, then how well do cell phones work on a plane, if at all?