Hello Chexeaghiek48
The best way is to check your minimum contract duration first. Once that is completed, the regular notice period for Sunrise contracts is 60 days to the end of any month.
Please note that Sunrise subscriptions can only be canceled over the phone or via the Sunrise Live Chat as written cancellations by mail or e-mail are unfortunately not processed. To proceed, the easiest way is to contact customer service directly by calling the dedicated cancellation number 0800 100 600 or by using the live chat. For further information, you can also check this page: Cancellation | Support
Salutations, cosmo