The description of Hangouts
Use Hangouts to keep in touch. Message contacts, start free video or voice calls, and hop on a conversation with one person or a group.
• Include all your contacts with group chats for up to 150 people.
• Say more with status messages, photos, videos, maps, emoji, stickers, and animated GIFs.
• Turn any conversation into a free group video call with up to 10 contacts.
• Call any phone number in the world (and all calls to other Hangouts users are free!).
• Connect your Google Voice account for phone calling, SMS texting, and voicemail integration.
• Keep in touch with contacts across Android, iOS, and the web, and sync chats across all your devices.
• Message contacts anytime, even if they’re offline.
Notes: Mobile carrier and ISP charges may apply. Calls to Hangouts users are free, but other calls might be charged. View our calling rates at https://www.google.com/hangouts/rates
• Bug fixes
• Android 8.0+ devices: Customized ring and chat message tones for individual classic Hangouts conversations and contacts will be removed. You can still customize general ring tones and messaging sounds for classic Hangouts by accessing Settings via the Menu section of the app.