Never experienced it before but it happened. When you see "Sim Card Registration Failed" on your mobile phone screen, it means your sim card need to be replaced.

I take almost 18 hours to figure this thing out!! Silly me...

Well, I went to the nearest Celcom Service Center in Tawau to refer the problem earlier today. I sat on Counter 6 where a nice lady was in-charged. Her name was Maslina. I ask her about the problem and she detected the problem in less than one minute. Hm... Thanks aaa..

Well, I changed the sim card for RM5 and now I'm available again... Heheheee...

REMARKS: Please take note....