Each one lightens up your screen, so they are hard to miss. Incoming messages when the app is running in the background can pop-up in two different ways: as a window in the middle of the screen or as a regular notification.

You can also buy Viber Credit and use it to make regular international phone calls, but keep in mind that you will need to have a stable Internet connection for that purpose. The Discover section is used to access public chats created by other users and websites, but that function didn't really fully catch up with users yet. Stickers are generally not free, but there are plenty of free ones to try out. It allows you to do almost everything you can think of: instant chat, make audio and video calls, and use special Viber stickers. It can be synced with your Contacts list, so that you can immediately see who is using Viber. Its Android version is often updated, and it keeps up with other messaging apps. iOS users often stick with iMessage, Western Europe and the United Stated love WhatsApp, but Viber appears to be dominating in Eastern Europe and Asia.

Price: $ The instant messaging race is a close one indeed and it appears that you can communicate instantly on almost every app available.

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