Yesterday, Google announced that the Assistant app is capable of making phone calls from Google Home smart speakers as well. This capability was available previously only to those using Google Assistant on a mobile. On the other hand, Amazon Alexa only supports device-to-device calls at this time.
According to Google's official blog post about this update, "Google Home by default can call businesses and your Google Contacts." Sadly, the recipient will only see "No Caller ID" or "Unknown" for now, but this problem should be sorted out "by the end of the year." After that, the mobile number of the Google Home user who is calling will be displayed. However, Google Voice and Project Fi users can already choose to have their phone number visible to the other party by going to the Assistant settings section in the Google Home app.
At last, we should also mention that calls to 911 are not supported.
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