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I am not sure if I have understood your question correctly. Do you mean to say that you want to embed your form in webpage which can be viewed in iPhone devices?
Here are the steps you should follow:
#1. Enable mobile responsive attribute of form. The following guide should help you: https://www.jotform.com/help/311-How-to-make-forms-mobile-responsive
#2. For your form to be mobile responsive, I would suggest you to please embed your form using its iFrame embed code. The following guide should help you grab your form's iFrame embed code: https://www.jotform.com/help/148-Getting-the-form-iFrame-code
Hope this helps.
Do get back to us if you meant to ask something else.