Google Home has been able to do the whole voice call thing in the US and Canada for a while, but Google just announced that this feature is coming to the UK. Oh, and it's free.
What's more, people will now be able to build a personalised voice profile so that Google Assistant can identify them by their voice. It's an opt-in feature, and means everything is personalised to you - not your flatmate/partner/children. That also means it'll know to phone your contacts, and not ring the wrong person.