阿里小号 is a productivity application designed for iPhone users, providing a virtual phone number without the need for a SIM card. Users can easily obtain multiple new phone numbers through the app, allowing them to switch between different numbers based on their needs. The app supports major telecom operators, enabling normal call and SMS functionalities across various scenarios, such as online dating, renting, buying and selling property, and more. The application emphasizes user privacy by allowing users to share a secondary number to avoid harassment.

The app's features include the ability to set do-not-disturb periods, making it convenient to manage communication. Users can obtain a new number without incurring additional costs, as calls and messages are charged according to the primary number’s plan. Initial setup requires a Taobao account and real-name verification through Alipay. The app has received recommendations from several media outlets, highlighting its utility and security.