[header] How to get free phone calls with smartphone apps [title] Notify your friends in advance that you're about to use an app to communicate with each other. [step] Tell them to download the app, which will be explained later in this article. [title] If your phone has a data limit, check if you still have at least 500 mb of internet data. 
[step] You might want to use a free public wifi if you have no data (or have little data left). [title] On your phone, launch the respective app store.