Yes, Clean Phone: Booster, Master typically offers a free version with basic features, as well as a premium version with advanced tools and functionalities.

Clean Phone: Booster, Master can operate without an internet connection for most of its features, although certain functionalities, such as updates and cloud services, may require internet access.

You can contact support or send feedback for Clean Phone: Booster, Master through the app's help section, or by visiting the official website or support page for customer assistance.

You can manage or cancel your Clean Phone: Booster, Master subscription through the settings of your app store account or within the app's subscription settings, depending on where you purchased the subscription.