How to add a G-Suite account to your Android device

Logging in via Android​
1. Open Settings -> Mail -> Accounts -> Add Account -> Google
2. Select Existing and enter your credentials
3. Finishing up the setting will allow you to use the Google Apps defaulted on your Android device (Gmail, Calendar etc)

For more in-depth instructions you can read the following article: https://support.google.com/a/users/answer/1738362?hl=en