How do i get my form to show on my facebook page via mobile phones, it is visible and works ok via laptop

The form is not shown on the Facebook mobile because of a limitation coming from Facebook. Custom page tabs cannot be shown on mobile devices.

You can take a look at the following bug report on Facebook:

https://developers.facebook.com/bugs/435173473172584/ 

You can add your form using the custom Iframe App method — https://www.jotform.com/help/82-Adding-a-form-to-Facebook-Custom-iFrame-App- 

There are also specialized companies who have dedicated their services to enabling Facebook tab pages to be shown even to mobile users. Examples of these companies:

http://blog.woobox.com/2011/12/woobox-short-urls-now-auto-redirect-to-tab-and-mobile/ 

https://www.tabsite.com/blog/mobile-solution-for-facebook-page-tabs/ 

http://blog.thunderpenny.com/2013/01/tabs-on-mobile/ 

You may want to consider checking on any of them and use it as a workaround to show your form in Facebook on mobile devices.