ja mobil is a free Android app developed by congstar Services GmbH, designed to provide quick and easy access to the personal ja! mobile customer area. With this app, users can log in easily and even use fingerprint login support.

The app is packed with a range of useful features, including the display of the current prepaid balance and data usage. The app also allows users to top up prepaid credit via cash code or automatically, carry out a tariff change, book, switch, and cancel options, view and change customer data, and view and change legitimation PIN.

Overall, ja mobil is an excellent app for ja! mobile customers, providing a range of useful features in an easy-to-use interface. Users can easily access their account information and perform necessary tasks with just a few taps on their phone. The app is free to download and use, making it an excellent choice for ja! mobile customers.