Spitz AX (GL-X3000) - cellular problem with WWW, social media works

Hi all,

Thanks all a lot, after MTU change WWW works OK.

I'm used Ping & Net app.

Proper MTU for this connection: 1394

My question:
MTU above works great in Poland (roaming in Orange) but when i cross borders to other countries MTU can be different? Other country = other roaming mobile operator.