I have to write again on this topic, i'm using visible-phone class on a module but it doesn't work.
http://www.genitorichannel.it
As you can see i have a banner (300x250) in the right sidebar, i use hidden-phone and duplicate this module to put in another position on mobile phones (in content-top-a) but i can't see anything on phones.
Thanks Damir,.
Yesterday i check it with my mobile phone Samsung with Chrome and i can't see the module.
But now i'm checking it on mobile emulator, i can see the module with firefox (all devices) but not with some device (Samsung) in Chrome.
Now i'm trying to check with some friends using different devices and browsers.
Which device and browser you have used for this test?
With Firefox i see the module perfectly, i check the banner statistic of one day with google analytics and i have non differences so it's ok, maybe the problem is my phone