One of the more interesting features of Google Home devices is the ability to make phone calls by simply asking Google. This feature has been available in the United States for several months now and the UK is the second market to get the feature. All you have to do is say "Hey, Google, Call Dave" or "Call Mum". If you've never placed a call with Google Home in the past, your device will tell you to go into the Home app and set up voice calling. Once you confirm your phone number, you'll get an SMS to confirm that you are the owner of the phone number. This is so when you make a...
Source: https://www.gsmarena.com/google_home_devices_get_handsfree_calling_in_the_uk-news-29971.php