G-Dragon Silent-modes his phone, while T.O.P. just uses a standard ringtone.

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 / Hyung Joon (not sure which their names are identical in Japanese!) – SS501

Kiseob – U-Kiss [Man Man Ha Ni]
Kevin – U-Kiss [Shut Up]
Cheon Juson – Co-Ed [Too Late]
Miryo & Jea – BEG [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 and Rihanna]
Ga-In – BEG [Christmas Song by Faith Evans]
Narsha – BEG [Like a Star by Corrine Bailey Rae]
Rana – 9Muses [Beautiful Thing by Xiah Junsu]

T.O.P. – Big Bang
CL – 2NE1
Sandara – 2NE1
Park Bom – 2NE1
Ye Jun – F.Cuz
JiHyuk – Supernova

Translated by: christabel88 @ bigbangupdates
Scanned by Tisya @ bigbangupdates
Source: KStar Lovers Japanese Magazine