Sorry to go slightly off topic, but I've left Vodafone for a deal with EE through CPW. I have my PAC code, and in theory I'll wait for the new phone & sim to arrive, then call EE and tell them the code. Then there's several hours/days to wait, right? So I'll be continuing to use my iPhone 5 until some notification pops up on the 6 to let me know the number has been changed over?
When you tell the code to EE, they should give you a transfer date, usually the next or the following workday, so that goes pretty quickly.