Dont change.. they really messed it up for me.. currently fighting for my money back.
i upgraded last month with orange as i was told in the shop i could not go 4g with ee as i had only just updated my direct debit details...
then 4 days later a lady from EE said i can do the switch over at no extra cost, no change in bill due date or anything. the only thing that would change would be the sim.. Winner winner.
Well i paid my bill on the 5th then 2 days later i got a bill from EE saying i need to pay a month in advance etc etc.
so not only did i pay orange for only a week on my new phone but now i have EE after the same money..
the are a bunch of w*****s