How to change subscription plans duration on iOS?

You can change the duration of your subscription through the App Store only if you purchased the subscription via the App Store. (Similarly, you can change the duration of your subscription on the ProxyMaster website only if you purchased the subscription through the website.) For example, if you want to upgrade from a one-month subscription to a 12-month subscription via the App Store, you must have purchased the one-month subscription from the App Store. To change your subscription duration on iOS: Sign in to the App Store account you used to get your free trial or subscription. Open your list of subscriptions. Select ProxyMaster. Select the subscription plan you want. Confirm your new subscription terms. Your new subscription plan will begin at the end of your current billing period.