Re: Switch from GiffGaff to Virgin Rolling Monthly
this is to make it simple for you
Keep your phone number when you leave giffgaff. If you are leaving giffgaff for another mobile provider, you'll probably want to keep your phone number. To transfer your number, you will need to give a Porting Authorisation Code to your new network.
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Just another VM user trying to help out so my answers may be wrong. If you do like my answer please mark it as helpful; it may help others