Well, please do this:
1The first thing you need to do is to login to Celcom Customer Service webpage, available at: http://www.celcom.com.my/ocs/ If you don’t have not signed up, then please do so. All you need is your I/C number and your phone number.
2 Once logged-in, go to My Account>Fair Usage Policy
3 You’ll be prompted with the explanation of the Fair Usage Policy with four buttons below it: Check Usage, Purchase Additional Data, View Purchase History and Help.
4 So click Check Usage to view your current data volume. Enter the Start Date and End Date of your billing cycle, then click Search. For your info, Celcom billing cycle is on 13th day of every month, meaning the data volume would be resetted on the 13th day.
5 You can then view your used volume in GB and of course other info such as allocated volume, throttled speed, date and usage. This feature comes is rather good as you can monitor your usage and help you decide whether you need to buy extra volume.
6 Currently, Celcom offers additional volume purchase at the rate of RM5 RM12.88 for 1GB or RM20 RM38.88 for 5GB. The purchased volume will be reflected in you next bill.
The source:http://keemanxp.com/blog/2010/how-to-check-and-manage-your-celcom-broadband-data-usage-limit.html Answered Apr, 09 2011