we had disc phones... they were very popular for a very very long time... everyone had one... the came in all shapes and sizes .. square... rectangular... round even... but central to them all was the disc that operated them... But we have been suffering from de-evolution... and we lost the ability to use these mystical devices... and now that wizardry is lost to the corridors of time... and we are stuck with stupid phones... Here is a bit of ancient footage of these wondrous devices and an explanation on how they worked... https://www.youtube.com/watch?v=PuYPOC-gCGA