The Samsung SlimStyle is a new simple handset that SKT users will now have available. Samsung SlimStyle (SCH-S540) is a 11.4mm slider phone that features:

2.1-inch display (176×220) display
CDMA2000 1x connectivity
1.3MP camera
SOS function
SMS spam protection
e-dictionary
Subway maps
microSD card slot
800mAh battery with up to 3 hours of talk time and 380 hours of standby.

colors now available for the SlimStyle are: black/red, black/pink and black/golden.

via: Samsung SlimStyle SCH-S540 comes to SKT | Samsung Hub