You can Upgrade Anytime from day 15 of a new plan and up to 45 days before it ends. There may be an upgrade fee depending on where you are in your contract.
As long as your phone is in good working condition, you can swap your current phone and sign up to a new 24-month plan.
Swap your current phone for the latest model online, in-store or by calling 150 from your EE phone. To check online if you're eligible for Upgrade Anytime: