SFOS is sadly not well known in the US as its not sold there, which has definitely hurt popularity. Lack of VoLTE support for quite a long time didn't help eith

SFOS is sadly not well known in the US as its not sold there, which has definitely hurt popularity. Lack of VoLTE support for quite a long time didn't help either. Still, it's a great option I recommend to anyone who wants to escape from the current duopoly.