Soooo, quick update.
Went to my carrier and exposed the situation. It results that the APN was not/not properly setted up.
You should check you APN settings:
Settings>Wifi and Connectivity>Internet>Sim (1-2)>Scroll down>Acces Point Name>Hit the plus icon (+) top right and add your carrier APN info.
If you don't want to go to a carrier office, check with a familly member or friend who has the same carrier as you.
Hope this helps. It was my solution.