I don't know man, most people that would play this sort of game have at least a working knowledge of how to internet (is that a verb?) I had no trouble using the site on my android and if there are people that don't have smart phones (and I know they're out there) then they aren't going to be trying to access the site through their phones. Regardless I don't think it's smart to do anything but maybe look at your roster and read the forums through a phone just so accidental bids and stuff like that doesn't happen.
Hat trick probably has a better Japanese contingent because Soccer (Football) is (correct me if I'm wrong) MUCH more popular than basketball, not just in your country but in many across the globe.
I'm sure that lack of competition has something to do with it as well which is why I think it would be a good idea for them to combine all of the sub 75 countries into one mega league so that people have others to play against, not only because I don't like that a team that just started (like myself a couple months ago) can instantly have more money than I do, but because this game is pretty fun, but a lot of that fun comes from competition, which stinks because the only way you guys from all these small countries can really have competition is if you play the cup and if you get knocked out by a mega team it's pretty much just a bot game where you get to make players and sell them. I'm sure these are issues that get talked about on the non-english small country forums a lot and maybe they don't get the attention they deserve.
I don't think you guys from small countries would mind sacrificing your personal leagues in exchange for more competition and players. But to be clear I also don't think that you guys should have your NT's taken away because I think every country should be able to represent themselves that way.