Features TEXTS - Simple, Reliable Messaging. Message your friends and family for free*. WhatsApp uses your phone's Internet connection to send messages so you can avoid SMS fees. GROUP CHAT - Groups to keep in touch. Keep in touch with the groups of people that matter the most, like your family or …

Viber is a light weight cross platform instant messenging and voice over ip client. It uses your phone number as a client ID so it requires a telephone computer to operate and offers very good voice compression that makes it perfect for slow 3g connections.