The way an LCD works depends on what sort of LCD it is - not what sort of device it is used in!


I think you'll find that all modern cellphones use an ASIC that includes a processor "core" - how else could they make 'em that small?!

ARM is probably the top core, but there are plenty of others.
What difference does this actually make to you?
If you want to know how GSM works, you'll have to look to the GSM specs - see http://www.3gpp.org/specs/specs.htm