K-Celebs who silent-mode their mobile:

Alexander (U-Kiss)
SooHyun (U-Kiss)
Park Jung Min (SS501)
G-Dragon (Big Bang)
Minho (SHU-I)
In Seok (SHU-I)
Jinon (F.Cuz)
Kim Hyun Joong (SS501)

K-Celebs who use their own songs as ringtones:

Kiseob (U-Kiss) – Man Man Ha Ni
Kevin (U-Kiss) – Shut Up
Cheon Juson (CO-ED SCHOOL) – Too Late
Miryo & Jea (Brown Eyed Girls) – Love Is…
Jin Seok (SHU-I) – Bomb Bomb Bomb

K-Celebs who use songs by other people as ringtones:

Eli (U-Kiss) – All Be There by Usher
Minji (2NE1) – Love the Way You Lie – Eminem ft. Rihanna
Ga-In (Brown Eyed Girls) – Christmas Song by Faith Evans
Narsha (Brown Eyed Girls) – Like a Star by Corrine Bailey Rae
Rana (9Muses) – Beautiful Thing by Xiah Junsu

K-Celebs who use standard ringtones:

T.O.P (Big Bang)
CL (2NE1)
Sandara (2NE1)
Park Bom (2NE1)
Ye Jun (F.Cuz)
Ji Hyuk (Supernova)

Hahaha lol at the ones using their own songs as their ringtones Ó_ò

source: http://kpoprants.wordpress.com/2010/12/23/%e2%96%ba%e2%96%bawhat-kind-of-ringtones-do-kpop-stars-use/#more-17432