Keep your number when you join giffgaff
To transfer your phone number to giffgaff, you first need to ask your old mobile provider for a Porting Authorisation Code (PAC). You can use then use the transfer form to submit your PAC and choose a date for the transfer. If your number has not been transferred by the day after the scheduled date, you can contact an agent about it.
Transfer your number to a new SIM
When you change your SIM card to a different SIM (e.g. to change to a nano SIM) you can transfer your number and existing credits and goodybag by performing a SIM Swap.
Phone number deactivation
SIM cards are deactivated if they are not used for 6 months. If you want to prevent deactivation, make sure you use your phone from time to time.
Change your phone number
If you need to change your phone number but do not want to create a new account and change your SIM card, you can do this in My profile & settings.
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. You can ask your PAC here.