Similar to telephone or other internet service you are billed monthly at the usage level you sign up for until you request otherwise. Your monthly billing cycle starts on the day you sign up and continues through to that day of each month (i.e. 5th of May to 4th of June, 5th of June to 4th of July, etc.) If you would like to downgrade or cancel you may do so prior to the close of a monthly billing cycle and the request will be made effective in the next monthly billing cycle.