Well, it doesn't. It was checked already, so I unchecked it, saved settings, checked then saved settings again but still no signatures for me. I'm starting to think they'll never show on phone, I'll try on a computer.
Now believe it or not - although I feel like an idiot for it - I even did a Google search about how to see people's signature on ult guitar but all I found was how to change your own because I read in this thread a lot of times that there's a link in yours to a shitton of tabs and I wanted to...