There are a legion of Android Apps to make free calls but these five are really impressive and whichever one you finally decide to stick with, will surely work for you like a charm.

So without typing too much let me quickly introduce you to these top five Andriod apps to make free calls. Excited? Okay, here is the list in no order of preference below;
Viber

Viber-iPhone-App.5
Viber gives you absolute freedom to make free international calls on your Andriod smartphone. Viber scans your phonebook for other users which would be added automatically to your list.

You can send free text and make free calls with impressive sound quality to friends using Viber app.
Viber has an exciting interface and is compatible with alot of phones.
Skype

skype
Skype has become an app that no one can ignore, its acquisition by Microsoft in 2011 for a fee of $8.5 billion really made Skype more exciting. Skype will let you send messages and make free calls to other phones.

You will need a very good internet connection to make the most out of Skype. Excellent voice clarity with HD sound is guaranteed.
Nimbuzz Messenger

nimbuzz
Nimbuzz has been available for quite a long time and has seen constant improvements. Nimbuzz is absolutely fantastic; its intuitive user interface makes the app a lovely addition to your app drawer.

With Nimbuzz Messenger you can chat with your Facebook friends, make free calls, and send free text. It has chatrooms where you can make new friends as well as support for offline messages. Download Nimbuzz and explore more incredible features.

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Viber Download: viber.com is known for its viber free calls and messages both on Viber Desktop, Viber for Windows PC, Viber on the App Store on iTunes,
http://www.techvaid.com/viber-download-www-viber-com-pc-viber-free-download/