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Google Assistant is not yet available on all Android phones, except Google Pixel not many smartphones based on Android OS have Google Assistant yet.
Personally, I'm looking forward to this update because I started to use more and more the "Ok Google" command in the last few years.
The big news is that Google Assistant will start being available also on a phone that runs Android 6 and not only on those that run Android 7.
This can be extremely helpful because it means I will also get an update on my LG3 smartphone, I don't really think I will get the update to Android Nougat 7 but at least I should have the new Google Assistant and benefit from the new features and AI algorithm.
I also hope I will get a language update because for now, I have to use English to make things happen.