I would like to change my number
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You can change your current giffgaff mobile number to a New (Random) number. (Without the need of changing any sim) and any current airtime credit or goodybags will remain on your giffgaff account. This procedure should take no more than 4 hours to fully complete. Go here: Request a New number goto , 'Phone number and SIM card' , 'Your number' , Click on 'change' , Then , If you wish to proceed. ' Click onto, 'Change your number'
However - If you have previously changed your giffgaff mobile number through the self service facility. You will then need to contact a giffgaff agent and request for this through them. Go here: Contact an agent
A giffgaff agent will usually reply within 24 hours from receiving you're message, However, They can be much quicker at less busy periods. The Agents hours are 8am to 10pm 7 days a week. And you will find their messages. From here: Agent replies
For further details on changing your mobile number with giffgaff to a Random number. Go here: Can I change my Mobile Number?