1

I have the compass app (Comes with the phone) on my iPhone 6 and it can still tell me my elevation even though I have no service, why is this? Is there a magnet or something similar in the phone?

It updates when I touch the screen so I know it's connecting to something somehow. Also, roaming is off and I am nowhere near a cell tower when that was taken.

4

This is determined by satellites in the horizon mapping out where your phone is (according to multiple posts on Stack Overflow, including https://stackoverflow.com/questions/13329714/how-does-my-iphone-get-its-altitude). Note that the accuracy from this method is not usually precise, but it is a rough estimate of your elevation.

0

It is using GPS signal, from satellites, and possibly air pressure (on iphone 6 and later I believe) for altitude.

And for direction it has a compass, i.e. a sensor which measures the earth's magnetic field.

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