4talk

4talk is a new, cross-platform (Windows, Android, Mac, iOS) and free IM messenger. It is tied to your cell phone number and allows you to communicate with other users, regardless of the device or OS they use, share files with them, arrange group chats, etc.

Unlike other modern messengers that use "cloud" technology only partially, 4talk keeps all user's contacts, correspondence, files exchanged with other users and other information in the "cloud". Otherwise, 4talk provides the whole range of functions, including text messaging, photos and videos, use of emoticons. Special mention should be made of the ability to send voice messages. 4talk provides a secure exchange of information, has a simple and clear interface and is easy to use and configure.