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

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Source: https://play.google.com/store/apps/details?id=com.google.android.talk