050-free is a free Android app for making VOIP calls. VOIP stands for Voice Over Internet Protocol. With this app, you can place cheap or free phone calls to other countries. It is always free to make VOIP calls to other users who also have the 050-free app.

Using 050-free doesn't require any type of monthly fees. In fact, there are no contracts or agreements at all. You simply take advantage of the free or cheap phone-call rates. Setting up an account to use the app is free as well. The account gives you a 050-prefix, Japanese number for calls.