These are the steps to cancel auto-renew YI Cloud subscription with Apple iOS. First, go to the home page on the Apple iOS device. Then click on Settings > iTunes & App Store > Apple ID: username@email.com or Sign in (If not signed in already) > View Apple ID > Subscriptions > YI Home > Cancel Subscription.

At the bottom of the screen the subscription says, you won’t be charged for the free trial. After the free trial ends, your subscription will renew at (the price paid) unless canceled by (the end date of the free trial). If you cancel the subscription for the free trial it will continue to work until the end of the free trial.

If you are using a paid subscription without a free trial, if you cancel the subscription it will continue to work until the subscription expiration date.  The service will not renew if cancelled 1 day before the renewal date.