Nubefone

Making calls without using minutes or your mobile data allowance is now possible thanks to Nubefone, a VoIP application available in over forty countries.

When you install the application, you are given one euro to call whomever you want as long as they are within the countries where Nubefone is available. The price of the call is three cents per minute for national calls and five cents per minute for international calls.

When the application starts, you will see a big dial pad and the tabs typically found on your mobile phone: favorites, recent calls, and contacts.

The call recipient won't receive any notifications that the call was made from this app, since it works as an integrated calling system.

Nubefone is a good way to save money, and it can be recharged whenever you want. What's more, for every friend you recommend, the app will top up your balance - so if you play your cards right, you can use it for free for quite a while.