Is your number transfer actually scheduled to take place today, malco39689 ?
The transfer normally takes up to one working day, and will usually have been completed by 6pm, however, it’s likely there will be disruption to both your old and new connections during that time, so it’s a good idea to make alternative contact arrangements until the port is complete.
Leave your old SIM in your phone until you see an error message like ‘SIM Card Registration Failed’ then put your giffgaff SIM in. Restart your handset every 30 minutes or so until it shows giffgaff as your carrier.
Messages from Agents regarding your transfer will appear in the messages section of your My giffgaff page. In some cases, you will also receive a message from your old network letting you know they’ve carried out their part of the transfer.
You can check the progress of the transfer at https://giffgaff.com/support/transfer
If everything is not working normally by 9pm on the confirmed day of the transfer, you should contact an Agent at https://support2.giffgaff.com/app/ask/Number-transfers/Transferring-my-number-to-giffgaff/form/ making sure you tell them:
i) Your old number
ii) Your current giffgaff number
iii) At least one alternative contact number
iv) The PAC from your old network
There’s a complete guide to porting at https://www.giffgaff.com/help/articles/how-do-i-keep-my-current-mobile-number-when-i-join-giffgaff