I’ve been with Vodafone forever, but it’s time to move on. Please explain to me how it works, because I have never changed before! I have a monthly sim only plan that expires on 28/06. I have just requested my PAC code. I would like to move to Giffgaff - is there a way to do it so I am not without my phone? Can I order a sim in advanced and then get them to put my number on it using the pac code? Help me please! (I really need my phone so my mum can get hold of me.)