Question Video unlimited doesn´t working while in german t-mobile network

Hi,

since the first day with my Xperia Tablet Z (and Xperia Z1) i´m facing the following problem:

While in WLAN networks there is no problem with the usage of video unlimited on both devices.

But on the road in the german t-mobile network i can´t start the video unlimited app.

I´ll get an error message that my position did not match with the account settings and the app is closing.

Whats the problem? I´m not sure. Checked my PSN settings, Germany as country setting is right.

Could this be a provider problem?

Anyone else faced this issue?