Viber lets you send free messages and make free calls to other Viber users on any device, network, in any country!

Viber syncs with your mobile contact list and automatically detects which of your contacts are on Viber.

• messages: text, photos and stickers
• group chats
• HD voice calls
• video calls
• full synchronization between mobile and PC clients
• moving incoming calls between devices

Telegram is a messenger that allows you to exchange text and voice messages and media files of many formats. It uses a proprietary server part with closed code, running on the capacities of several companies.

In addition to the standard exchange of messages in dialogs and groups, the messenger can store an unlimited number of files, maintain channels (microblogs), create and use bots.