Can you elaborate on what was wrong with your cellular connection?

My plan advertises "up to 50 Mbit/s" on a 4G connection. I was getting less than 1 Mbit/s a lot of the time. Websites and videos would not load properly.

I downloaded the app of the german ministry that allows you to take speed tests and file a complaint. After multiple weeks of measuring connection speeds on the cellular network, I was able to file a complaint.