Read my previous response where you can see the deals available to you.
You would need to request a PAC Code from O2 by texting PAC to 65075, then you can submit this to port your number when ordering the device and plan through the site, or once you've received your new EE SIM by texting PORT to 150 from said SIM. This process will ask for the number you wish to transfer, as well as your PAC Code.
Once you have submitted the port request, the number will port in 1-2 working days after inserting the EE SIM to a phone to activate it.
