How to disable data roaming notification? ('solved') Is there a way to disable data roaming notifications?

I get them every few minutes when I'm working abroad. And it happens on every acceptable roaming setting (off/national), international roaming setting is no option.

Also, long press > App info (Phone app) > uncheck 'Show notifications' doesn't solve anything.

Android: 4.4.4 &amp; 5.0
Phones: Sony Xperia Z1 compact and Z3 compact (but was also a problem on my previous phone on Android 4.1)


Screenshot with notification (click image for larger variant)

Edit: This issue has solved itself as there's no extra charge anymore roaming within the EU.
This was a big annoying factor for me and I eventually solved it, but it requires Xposed (which needs root).

If you have root and Xposed, you can install XphonePlus to disable the data warning and modify the phone's notifications for calls, mobile data and many more.

Not sure if there is an alternative without rooting.