@messayisto
my phone has an IPv4 address and can access the store just fine - if the store was not compatible with IPv4 they would have heard of it as open-store.io does not even have an IPv6 address.
Maybe it's a problem with your phone provider, configuration of a CGN or network routing, the full path to the destination will usually not be controlled by them, these problems can't be checked locally. If you can't connect at all with a browser, maybe they'd be interested enough to investigate; use Firefox since Morph will not be known to them.