Are you one of the Celcom postpaid customer?
Then you must be lucky because Celcom has come-out with the self-managed account management, accessible via https://onlinepostpaid.celcom.com.my.
Kindly take extra note on the ‘http’ and the ‘https’.
However, you may need to sign-up first if you haven’t register.
Search from Google:
www celcom com my, celcom online customer service celcom postpaid, www celcom com my/onlinecustomerservice, onlinepostpaid celcom com my