Fist of all its
symbian... not sybian.
Symbian is the DEFACTO os for CellFones... (those havin a RISC CPU).
U may also call it a firmware.
to know more abt symbian go to *www.symbian.org.
Smartfones r fones dat r smart... :
: lol.. jus kiddin pal. Well as said earlier.. smartfones r fones with os, supports an array of apps and r good in resources. to cut the story short... smartfones r small handheld pc's... sum evn support winxp and win mobile.
And yeah, nokia 6600 is a smart fone indeed...
well i hope this answers all ur queries...