Viber is an application for iPhone and Android phones that lets you make free phone calls and send free text messages to anyone who also has the application installed. Its similar to Skye except you don’t need to add contacts or ask for IDs.
In order to use Viber you must allow it to access your address book. If this is OK with you, click OK when that prompt appears after launching the app.
Follow prompts and enter your phone number. You will receive an access code by text message that you’ll be prompted to input into the appropriate field.
Now you’ll be able to browse through your phone contacts and see who already has the application downloaded. In the app there is menu bar that lets you sort contacts according those who already have the app. For those contacts simply tap their name and then select either “free call” or “free message”
If you want to use Viber to call or message someone who doesn’t have the app just tap their name and click “invite to Viber”. They’ll receive an invite SMS from you and can then download the app so you can communicate for free. Otherwise you can always call them with normal usage charges from within Viber.
In “Settings” you can opt to invite people via email instead of SMS.
Remember what makes Viber convenient is that you can use your real contacts and phone numbers. However- this means you are NOT communicating anonymously. If you need to communicate anonymously you should use Skype or another tool. Check out these guides for more ideas.