Contact the business and say you want to cancel the contract because you're still in the cooling-off period. You'll probably need to give them details such as your account reference number - check any documents or emails you have from the company.
O2 end of contract tariff options If you happen to be out of contract with O2 already, it will send you an annual reminder that you're still paying for an old tariff. In these notifications, O2 will offer you a selection of new plans that you could move onto once your fixed-term is finished.
Almost all providers require 30 days' notice if you wish to leave.
Canceling a Cellular Service Plan To get out of a phone service contract, contact your plan's customer service. You can also try to sell your plan, contact a different carrier for help, or view your contract for loopholes.
Go to your O2 account and select 'Membership and Subscriptions' Scroll down to 'Cancel Subscription'
O2 end of contract tariff options If you happen to be out of contract with O2 already, it will send you an annual reminder that you're still paying for an old tariff. In these notifications, O2 will offer you a selection of new plans that you could move onto once your fixed-term is finished.