maXXim Servicewelt is an Android app designed to provide an all-in-one solution for managing your handytarif on the go. Developed by Drillisch AG, this free app falls under the category of Business & Productivity. With maXXim Servicewelt, you can stay up-to-date with your tariff information and have all the important details at your fingertips.

The app offers a wide range of features, including the ability to view your invoices, update your personal information, and book or deactivate your additional options. You can also order a replacement card or Multi-/UltraCard, and even request for repair services for your mobile phone. The app has a FAQ section and a contact form to help you get the assistance you need. Moreover, you can easily access the settings for your smartphone, and order top-notch smartphones and handy in the app's handyshop.

It's worth noting that the app's availability cannot always be guaranteed. Overall, maXXim Servicewelt is a user-friendly app that can make managing your handytarif simpler and more convenient.