Question: how long does it take to transfer a giffgaff sim?
Answer: You will need to perform a simple SIM swap if you wish to change to the new SIM - The SIM swap process will transfer your current number and any active goodybag/gigabag/airtime credit over to the new SIM. The SIM swap should take no more than 30 minutes but, during busy times can take up to 24 hours to complete.