A free program for Android, by Google LLC.

With Google Assistant for Android (Go Edition), you can ask your questions and get your answers quickly. You can also make voice and video calls, send text messages, and more, right from your phone.

To start using Google Assistant, open the app and tap on the ‘Google Now’ icon. You will see a menu at the top with several categories, such as ‘Calendar’ and ‘Translations.’ If you want to use Google Assistant for Android (Go Edition), tap on the ‘Google Assistant’ category.

The first thing you will see is a submenu with four items: ‘Make calls’, ‘Send messages’, ‘Play music, and ‘Get directions.’ Select the first item and tap on ‘Voice calls’ or ‘Video calls.’