The new features will be rolled out to users around the world in the coming days

Google adds audio-only calls to Duo, file-sharing feature to Allo

Allo functions on artificial intelligence, its servers store information to anticipate a user's response

Google launches messaging app Allo; features pose privacy concerns

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Google adds audio-only calls to Duo, file-sharing feature to Allo

Google launches messaging app Allo; features pose privacy concerns