How to make Free calls to all networks on your Android phone using 2g network

Here is a new application I stumbled upon to make free call on your Android phone without your credit but with a 2g network,though its not new I just stumbled on the application now and I decided to share it on this great blog to you all our great and wonderful readers. The app am talking about is NANU. NANU gives you the opportunity to make calls for free, regardless of time, place, or account balance.
It does not require the 3G network to work as you can use it with the 2G network. This awesome app called Nanu produces clearer sounds, and you are also able to make free calls without airtime to those without the app on their mobile phone.
It works perfectly in congested networks also works for free night calls, and it gives you not less than 40 minutes of free calls without credit to any mobile network with just 10mb.
To download NANU go to playstore and search for the keyword "nanu" register and verify your mobile number  to enjoy free calls to all networks. 

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