1.   UMB (*118#)
       E.g. Dial *118# , select Mobile Service > BlackBerry
       Then select the BlackBerry service according to the plan you wish to subscribe.
2.   SMS (short code: 28118)
       E.g. Send to 28118
You will be prompted a message Ie : "Depending on your data plan you might incur additional charges. Do you wish to continue?" on your phone, by clicking "OK" you will be charged 5sen/ MB.
For internet tethering you will be notified with the following on your desktop manager
Yes, you will be able to use all BlackBerry® Internet Service while roaming in Celcom 2G. Video streaming and internet tethering will be available nationwide from 18th March 2011 onwards, it will be charged at 5sen/ MB.
Data usage for BlackBerry® Internet Service is included in your Blackberry® Service plan.
For BlackBerry® Internet Service Monthly it will be automatically renewed monthly.
For BlackBerry® Internet Service Daily & Weekly it will not be renewed. You will need to sign up again by dialing *118# after your BlackBerry® Internet Service plans has expired.
An SMS reminder will be sent to subscriber to inform that renewal will happen on the following day. If you do not wish to continue to renew the package you may send request to stop renewal function by dialing *118# and select “BlackBerry (BIS)” and “unsubscribe”.
System will not perform the renew package and will terminate the package on expiry date.
* For BlackBerry Daily package, SMS reminder will be send at 5pm on the same day.
* For BlackBerry Weekly, Monthly package, SMS reminder will be sent out one day before service expiry.
Yes, you’re allowed to un-subscribe it any time before the service package expired. Once successful, the service will not be available at same day at 23:45.