Sitimohd wrote: I'm just wondering if I can change my phone number while still in contract and if yes, is there any charges?
The link @Cyrille13 has posted is spot on - it will give you all the info you need to know about changing your mobile number - thanks @Cyrille13! You can change your number at any time, whether you're in contract or not.
Is there a particular reason you're looking to change your number? If it's something we can help with, please let us know.