Top 5 free mobile apps which can help you to reduce phone bills

I am using below given mobile apps from last couple of years and these apps really helped me cut down my mobile phone bills. 

Please Note* For good voice quality, need a good internet speed at both ends while using these.


1: Skype: 
This app lets you do text messaging, voice and video chat. Skype to Skype is free. 

2: Viber: 
With the help of this app, user can do text messaging and voice calls free from viber to viber user. You don't require to register a separate user name for this app. After you have installed the Viber app, it syncs your contact list, automatically detecting which contacts area already using Viber.

3: Google+ Hangouts: 
It lets you make free video calls that can be one-on-one. 

4: Fring:
It enables you to make free calls. The group calling feature helps you to talk simultaneously with up to 4 users. 

5: Nimbuzz:
It lets you send free messages and call other Nimbuzz users.