If someone signs my iPhone with permanent marker will it stay on?

I'm going to meet Ed Sheeran next weekend and I want him to sign my iPhone, does permanent marker ink stay well on iPhones? Will it fade or rub off? I have screen protectors to put on the back of my phone so I could do that but will it peel off with the back protector?

I don't know if anyone even knows the answer to this but 10 points if you do!

Try the marker on a piece of glass. Try rubbing it off.