To switch to a Giffgaff deal, you just need a PAC (Porting Authorisation Code) from your current provider. Follow these three easy steps:
1. Text PAC to 65075.
2. Purchase and activate your giffgaff SIM online. (You’ll be given a temporary phone number).
3. Once you’ve activated your SIM, you can change your temporary number to your existing number via the giffgaff website using your PAC. If you want a new phone number, then you just need to set the temporary number as your permanent one.