viber

Viber

 18.8.0
Free   
84

High quality voice calls for free to all of your contacts

fring

Fring

 4.5.2.2
Free   
5

Keep the contact with all your friends and family relatives with Fring.

voxer walkie talkie ptt

Voxer Walkie -Talkie PTT

 2.7.12.015020
Free   
4

Do not spend any more money in calling people or sending messages to them: use Voxer and you will have all you need completely free.