You can cancel your plan at anytime with AT&T but if you are still under contract you may get an ETF ( early termination fee). Find out when your contract is up and it may be more monatary wise to switch to a lower plan and run out your contract. What happens when you want to cancel is they will try everything to keep you as a customer, depending on your LTV, then trfr you to the save team, and they will try to talk you out of changing service providers. Stick to your guns!