Hi @Anonymous User
If you just want to use the free Apps on the stick in the future such as YouTube, BBC iPlayer, ITV Hub etc etc and don't want to pay for the NowTV passes on the stick once your vouchers have finished.
Then that would be fine, as long as you make sure you cancel any active nowtv passes on your account before the next scheduled due payment date or dates.
When you cancel, it is important that you follow all the steps on screen until you get the cancellation notification message and it also shows cancelled next to your pass that you have activated.
Each active pass needs to be cancelled separately.
Further info here about cancelling a nowtv pass.
https://help.nowtv.com/article/how-do-i-cancel-now-tv
Some more info here about watching the free Apps that comes with the nowtv stick without an active nowtv pass.
https://help.nowtv.com/article/do-i-need-active-pass-to-use-now-tv-box-stick
