Hangouts Meet has just added a new feature which allows you to connect to a meeting using a phone number as an alternative to the meeting code. This includes when you’re away from your computer, like if you're commuting or don't have a data connection, and you need to call into your Meetings while on the go.
This feature will automatically be selected when you select the Hangouts Meet conferencing option while creating a calendar event in Google Calendar.
Note that this dial-in feature uses an international phone number, which allows meeting participants in other countries to join the meeting.
For more details review this KBA Hangouts Meet Meetings with Dial-in Phone Numbers
Partially reposted from the https://gsuiteupdates.googleblog.com/2018/04/g-suite-basic-and-business-customers-dial-into-Hangouts-Meet.html
