Số Lạ is an Android app designed to detect spam calls, display caller IDs, and effectively manage unwanted calls with a robust blacklist feature. It covers a wide range of unwanted call categories such as spam, advertisements, real estate, debt collection, black credit, financial investment, and gambling. The app also serves as a comprehensive Vietnamese contact directory, including company contacts, business establishments, and individual names associated with phone numbers.

With a user-friendly interface, Số Lạ prioritizes personal data protection:

• No phone number input required.
• No registration or login needed.
• Does not access phone contacts.
• Automatically updates in the background when the app is closed, ensuring the blacklist is always up to date.

Upon installation, the app is ready for immediate use. The blacklist is continuously updated based on user reports and data analysis from social networks.