Is Regpack mobile optimized?

Yes!

Regpack's iFrame and hosted template will automatically redirect to a mobile optimized page when the system detects a mobile device if your website isn't mobile optimized.

If your website is already mobile-optimized, you can turn this setting OFF in Project Settings --> Appearance --> turn "Auto redirects to mobile optimized site for phones" Off and save.We recommend that you TEST the experience on your website on a mobile device with this setting off and on to determine which is the best option for your business.