The description of Hangouts
• 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 calls, 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