Not available everywhere yet, is it regulatory reasons or coverage? What satellites does it work with?
It's a completely different band from Starlink satellites though, but I suppose new satellites can incorporate additional hardware (not sure what the antenna design would be though... VHF wavelengths are way bigger...).
Swarm provide global coverage over all regions, but there are regulatory restrictions for specific countries.
The current list of approved countries / regions for the M138 Modem is: USA, Antarctica, Australia, Austria, Brazil, Canada, Colombia, Denmark, Georgia, Germany, Greenland, Iceland, Ireland, New Zealand, Netherlands, Spain, Sweden, United Kingdom and International Waters (12 nautical miles offshore).
Swarm continues to grow this list of approved countries as quickly as possible. Customers will receive regular updates on approved regions through the Swarm newsletter.