Question: how long does it take to transfer old number to giffgaff?
Answer: It can take up to 24 hours within the given day for a port to complete successfully. Please allow 24 hours for your O2 number to port over to Giffgaff. https://community.giffgaff.com/t5/Getting-started/How-do-I-keep-my-current-mobile-number/ta-p/352112...