Lets say you found a good deal at another network and willing to move your number to there. but also you don't want to leave giffgaff as you want to still keep your paybacks. So why is it not possible if we keep our account as they are but can move the number to a different network.
that can be sorted by giving a new number for giffgaff and continue the account on that.
this would help to get back to giffgaff easily in case the new network isn't loved much.
I know that there is an option of changing the number, but in that case you cannot use your original number in another network.
Also, I know that you can activate another sim under the same account but again, your rights will be valid until you more your original number.
Listen Giffgaff, this will not harm you at all. In fact, this will help your customers to have a 'widely 'open door to get back whenever they want.