Hi Dario,
We are really sorry to say that, there has no Phone Number information field/space available in the header based on the theme UI. Please check out our theme live demo as reference. Actually, it was mistakenly available in the Back-End (CoSolu Options) and we are sorry about that.
However, you could use Phone Number information in the Email field and it will work.
Moreover, we have listed the issue in our theme update list. We will remove the field from the Back-End (CoSolu Options) in the next update of the theme.
Thanks to inform us about the issue.
Best Regards,
ThemeLooks Support Team