Not at all, but make sure beforehand that your giffgaff SIM is fully activated and working.
Just keep in mind that if you’re not using the old number it may expire. This usually takes at least six months. Expired numbers get recycled and you won’t be able to bring the number over.
When you're ready and certain that your new giffgaff SIM is working just click the button to start the process of transferring your number:
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