Some Things to Consider When Performing Your Search
However, it’s worth noting that someone may not be active on Hangouts even if they have the app installed, so it’s not always a reliable indicator of whether or not someone is available to chat. If the icon is gray, it means they are not currently using Hangouts. If you are using Gmail, you can also see if someone is on Hangouts by looking for the green “Hangouts” icon next to their name in your chat list. You can also send them a message in Hangouts and see if they respond. If someone is on Google Hangouts, they will typically show as “online” or “active” in the Hangouts app or website. How Can You Tell if Someone is on Google Hangouts?
How to Perform a Google Hangouts Search Using a Mobile Device
