Just made a mobile to another mobile from Australia to UK and was amazed by how clear and non laggy it was. How does the signal get sent back and forth from one side of the world to the other? Satellite or cable? Radio or fibre optic?
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Generally not via satellites, unless you happen to be using a satellite phone to make a call from a remote location because nothing else works – in which case you’d know about it.
Satellites are too expensive, and geostationary satellites, which are the only ones you can aim a satellite dish at without having to constantly move it, are much too far away. It talks about a quarter second for a signal to get up to a geostationary satellite and back to earth. So for a phone call for a signal to get from your voice via a satellite to your friend, and then for you to hear their response (which might be them stopping talking) via the same satellite it would add about a half second delay.
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