

Ghost is meant more for hosting blogs and newsletters, not necessarily an interactive site.
Lots of static site frameworks out there: Hugo, Gatsby, Jekyll - all with their own strengths and weaknesses. Hugo probably has the largest following and template ecosystem, so may be faster to get started. Something a bit different that has some steam behind it is Grav CMS.
That, or your phone is using an overridden DNS server and not your local DNS resolver while on your own network. Common with Android specifically.