yooopi is a free Android app developed by A1 Telekom Austria AG that allows you to easily manage your mobile account. With yooopi, you can keep track of your free units, current cost status, invoices, and itemized bills from the last few months. Additionally, you can access information about your contract and make personal settings, including changing your tariff, activating additional packages, and upgrading your units.

The app's features are comprehensive, including an overview of the costs incurred in the current billing period, remaining free units (data volume, minutes, SMS), recent bills and itemized bills, query and top-up of prepaid card balance, simple number portability, SIM change, managing multiple SIM cards using the group function, roaming settings management, value-added service blocks management, setting call diversions, and a contact form.