newsjunkie247, Facebook removed extra info which contained client (web/other/mobile/messenger) and now I'm getting only some list of "mobile friends" which can't be taken seriously as it seems it marks almost everyone as "on mobile" who somewhere in the past used mobile phone, or something like that.
That's why I stopped using the "on the phone" status completely. You can still set "FetchMobile" to some value, but it doesn't show people correctly... I don't recommend using it.