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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Please try first adding the Mobile Responsive widget to your jotform http://www.jotform.us/form/60205007902139. The widget should help the form become responsive when used in mobile browsers as well.
I did test this on my test form and it has work as intended when I test on iphone browser.
Hope this help. Let us know if this did not work for you.