With the Google Chat app, you can send instant messaging to individuals or spaces, share links to Google Docs, Sheet and Slides and search conversations for content.
You can download the Google Chat app for your mobile device at the following pages:
To launch Google Chat on your mobile device:
Tap the Chat icon on your device
Choose the account you wish to use to access Chat
Tap Continue
Your chat contacts will be listed - click on a contact to view your previous conversations with them and to send a new message.
Click on the Spaces tab along the bottom of the screen to see the spaces you area member of - tap a space to view and send messages in that space.