Form is not showing on Facebook page if I login through mobile phone

My form is not loading if I login through mobile phone

You may consider adding first your form to your Facebook Fan Page if you have NOT done it yet. Use this guide: http://www.jotform.com/help/123-Adding-forms-to-Facebook-Facebook-Developer-Method- 

And probably this problem is related to the Facebook itself. You may check the following thread on Stackoverflow:

Is it possible to show a Facebook app as a Page Tab on mobile devices?

Hope this will help. Let us know if you need further assistance.