who are you porting from? you should be able to do it yourself in selfserve.
login to your account
then click this link (plan and add ons, ->change phone number)
click transfer phone number
the enter number and check eligibility
make sure you know your old account number and name exactly as is on your account, also put an alternate number of a friend. and click i am authorised before doing anything else.
there is a full list of things to do when porting somewhere in the forum
