4. Kik Kik

It is a messaging platform for iOS, Android and Windows Phone. Unlike some of its competitors, it does not have voice calls, which can be one of its biggest deficiencies. Still, it has the ability to send messages to anyone, anywhere, as long as both users have Kik. A special feature is a built-in web browser, which allows a more fluid exchange of web content with friends. It claims to be the first messaging application with that feature.

Kik has been growing rapidly, as the company reported 50 million users in April 2013 and 100 million users that same November. Now it claims to have 120 million users, although RW reports a base of 130 million registered users for the application. Whatever the case, the application is going well by itself and is likely to continue to do so. On Google Play, the app has a 4.5-star rating after more than 839,000 votes.

3. Nimbuzz

Founded in India, Nimbuzz is "available for all smartphones and feature phones" according to the description of its application in Windows Phone App Store, with support for Windows Phone, Windows, iOS, Mac OS, Android, BlackBerry, Symbian and Java. In addition to having text chat, with stickers and high-definition voice calls, it also has chat rooms and a phone application number call service called NimbuzzOut.

What you can do being one of the most outstanding features of Nimbuzz, and an uncommon feature, is the support to communicate through other messaging clients within the application. If you want to talk with Facebook friends or Google+ contacts, Nimbuzz can do so in addition to communicating with other Nimbuzz users. With more than 150 million users, it is a solid choice for the most popular messaging applications.

2. Tango

Tango follows the same style as the others on this list, offering an exaggerated messaging service that includes text messages, also with stickers, voice calls and video calls. The platform also offers a type of news to share content with all your friends, similar to Facebook, in addition to having a function to find people that you may know. To round it off, it includes games that you can play with friends, in case the conversation alone is not enough.

1. Viber

Viber is a cross-platform application available for Windows, Windows Phone, Android, iOS, BlackBerry, Bada and Nokia. It offers easy communication through free text messages, messages with photos and calls, as well as sharing the location between Viber users through data connections. It also has a function, such as NimbuzzOut, to communicate with non-Viber users for a price through the ViberOut tool.