JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You'll need to make the form mobile responsive, here's a guide on how to do it: http://www.jotform.com/help/311-How-to-make-Forms-Mobile-Responsive.
Also, is the form embedded on a website or you are viewing it directly using the form's URL?
Do let us know if the suggested solution worked.