I've a question about the template "Ultimate".
I build a website: karklingels.nl but i have a problem with the menu on smartphones.

I can't see any menu item on smartphones and i can't find a solution for it.
Does anyone know what it can be?

Did you read the instruction inside your unzipped template package?
You can read it online too:
www.joomlaplates.com/support/documentati...etup-the-mobile-menu

Sometimes it happens, that cell phone began fail. It's well known problem. If rebooting doesn't help, try to sync your phone with pc through bluestacks , open source files and recover it by yourself. Must help