What is JotForm?
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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To clarify, the Version 4 form builder is the one you are having problems using on the mobile device, is that correct? May we know the specific handset and the browser you are using? And may we know what actions you were doing? Is the problem specific to a function, feature or button?
I tried it on an emulator specific to iPhone 6 Plus iOS 8 on Safari, here's how it looks like:
I also tried it an actual Android device Chrome browser that I have:
I didn't have issues on navigating or by adding new fields. Could you please provide us more information?
We'll wait for your response.