Before the invention of smartphones and hi-tech mobile OS users mainly used their phones for calling and messaging. Since that time the call costs have been inflating. With improvement of technologies, the users are blessed with plenty of apps that they can use day today for varied purposes. One of the main purpose being free calls. With National and International call rates heavily shooting up the following Android Apps will let you to make free phone calls at a much less price (data connection charges/Wi-Fi charges alone).
The following are top free phone call apps for your Android/iPhone/Windows devices: