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.
You can use 3rd party applications on your FB page that supports mobile URLs. The best one that works is Static HTML Iframe App. I can see you are using it on your FB page already. There's an available short URL on the upper right side on the Staticc HTML app when you are on edit mode. Example:
You can use and share this to your form users for mobile viewing.