CAT eService is a free Android application developed by National Telecom Public Company Limited (NT PLC) that provides users with easy access to CAT's information, promotions, and news. The app requires registration and is compatible with Android 4.1 (Jelly bean) or later, with connection support for 3G/EDGE/GPRS or Wi-Fi.

The app's main features include a user profile, history usage, online payment, add/remove service, news and promotions, and contact options such as maps, chat, call center, and e-mail. With this comprehensive set of features, users can easily manage their CAT services and stay up-to-date with the latest news and promotions.

Overall, CAT eService is a useful and convenient app for CAT users who want to have quick and easy access to their services and information. The app is user-friendly and easy to navigate, making it a great tool for managing CAT services on-the-go.