The info below assumes that you are not on a
plane that equipped with an operating micro-cell system.
Cell phones throttle transmitter power based upon
the received tower signal strength to conserve
battery power, to reduce interference to adjacent
cells and to better equalize signals from
multiple calls coming into the receiver
simultaneously. Cell phones rarely operate at
full power except when in extremely rural areas
when located near the outer perimeter of widely-spaced cell towers.
If you are on a flight taking very much flight
time, you will have a nearly dead phone battery
if you don't either turn it off or put it in
airplane mode. Otherwise, tower signals will be
so weak that the phone will almost constantly use
full transmitter power trying reaching a cell
carrier that will register its presence for receiving incoming calls.
The closest towers under the plane will not
usually be reached because of (1) the metallic
plane body between phone and antennas below the
plane and (2) the cell tower antenna'e vertical
plane beamwidth focused to the horizon and below
(beam-tilt). So, there will be signals from a
bazillion cell towers which ring the horizon that
are line-of-sight, each competing for your cell phone's receiver.
You will notice how very warm the cellphone is from all that activity.
If you go on a cave tour, the phone will do the
same thing but won't be having the receiver
interference issue, it will just keep trying to reach a tower using full power.
Alan Kilgore, CPBE
WRVM Chief Engineer
At 08:59 AM 3/10/2017, you wrote:
Just a thought on "Airplane Mode"... that
usually shuts off all RF in/out of the phone.
(Cell towers, Bluetooth, and WiFi)
A "Do Not Disturb" feature would be a better choice. :)
On Wed, Mar 8, 2017 at 6:48 PM, Rich Roszel
Also, with either app, it would be worth turning
all notifications off and putting it in airplane
mode in terms of being able to accept calls.