Three is a free mobile network management app developed by Hutchison 3G UK Ltd that is available for iPhone users. The app provides a range of features that help users stay in control of their mobile usage.

With Three, users can view their bills and usage, manage allowances, and get add-ons. The app also provides exclusive access to offers and allows users to connect with the Three team through live chat. The app's side menu offers quick access to frequently used features such as Three Communities, a great way to get help, and Three+ for rewards.

Users can view up to 12 months of past bills and get a breakdown of their bills, including extra charges. They can also search for new devices and accessories using the app's search function.

Overall, Three is a comprehensive tool that provides users with everything they need to manage their mobile network usage. It is a must-have app for Three users who want to stay on top of their account on the go.