Viber Messenger for Android is a free, cross-platform messaging and VoIP app. It allows Android users to :

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Send text messages:

Communicate with other Viber users via text chat.
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Make voice and video calls:

Connect with individuals or groups via high-quality audio and video calls, often for free over a data connection (Wi-Fi or mobile data).
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Send photos and videos:

Share multimedia content with contacts.
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Create group chats:

Establish group conversations for multiple participants.
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Share location:

Share your real-time location with others.
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Use stickers and GIFs:

Add expressive elements to chats.
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Make international calls:

Call landlines and mobile phones worldwide at competitive rates (this usually isn[SQ]t free and requires credit).
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Secret chats:

Send end-to-end encrypted messages that disappear after a set time.
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Communities:

Create and participate in larger group chats with public visibility (like forums).

Essentially, it[SQ]s a comprehensive communication app similar to WhatsApp, Telegram, or Messenger, offering a wide range of features for staying connected. The "for Android" specifies that it[SQ]s the version designed specifically for the Android operating system.