I'm writing this turned wifi off and connected to O2 Germany zte 3565-z UMTS stick.
Tapatalk, browser, play store are apps I've tested until now. All working fine.
I will do speed test next.
Thanks a lot for your hint.
---------- Post added at 02:54 AM ---------- Previous post was at 02:45 AM ----------
This is fly sh**
Provider is slow but I couldn't believe that this is working without doing any stuff. Just installing this widget and permitting root.