Yes, if you get hbo the will charge you a prorated charge for this month and a full charge for next month. When you cancel the will rebate you the cash for the day you did not use. There is a $5 downgrade charge so in the end it will cost approx. $9. Right now you can get 3 months of hbo and starzs for free if you reup your contract to a new 24 month one. If you do not mind a new contract this would be the best way to handle this because it would be free.