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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At this time, I am not really sure what it is you required with 'mobile'. I can only assume that you probably meant 'How to have mobile responsive form'.
You can achieve this using the Form Designer.
Enable the option in the Design property
Hope this help. Let us know if you need further assistance.