Launched in South Korea first few months back, Bixby did not do much well in US even though it got out in USA. Bugs and lack of features have plagued Samsung’s personal assistant Bixby. While Samsung is still prepping for global release of Bixby, but users from US, UK India etc. are reporting of receiving updates for Bixby, Bixby PLM, Bixby Wakeup, Bixby Dictation and Bixby Global Action.
These updates however didn’t enable Bixby to regions outside USA and North Korea. Seems like there is a server side switch to enable Bixby’s features. However you can use Bixby’s Dictation feature by holding the Bixby key while using Samsung’s default keyboard.