How to keep your number when changing phone or network with Vodafone If you've already bought a new plan, you'll need to give us: The mobile number you want to keep The Porting Authorisation Code (PAC). Don't have a PAC? See our FAQs The temporary Vodafone mobile number we gave you when you took our your new plan Once you have all of these, complete the switch my network to Vodafone form. in Public bookmarkswith phone