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The page tab does not appear on mobile devicesAsked by emadoz00 on November 24, 2016 at 02:10 AM
THE FORM IS NOT WORKING ON IOS
Page Tab apps are not supported on mobile devices like Android or iOS by Facebook's Platform. You can check a discussion of it here: https://developers.facebook.com/bugs/435173473172584/
As an alternative way, you can try using the Custom iFrame Method. By this way you can add your form in your Facebook page which can be viewed on Mobile devices. You may wish to view our user guide which is about Adding Forms to Facebook Custom iFrame App Method.
If you need further assistance, please don't hesitate to ask.