Nachweisverfahren Mobilfunk is a mobile application designed for Android that assists users in measuring the performance of their mobile internet connection. It allows users to compare the actual measured speed of their connection with the maximum speed they are contractually promised by their service provider. This tool is essential for users experiencing reduced internet performance, providing an objective way to document speed issues through structured measurement campaigns.

The application facilitates the measurement process in a few straightforward steps. Users input their tariff data and initiate a measurement campaign, which can consist of up to 30 measurements over a maximum of five days. After completing the measurements, the app generates a signed PDF report if a performance issue is detected. This report serves as formal evidence for users to address their concerns directly with their internet service provider.