Simply install our Nalo app on your phone or tablet and use your credit for any international calls. You'll need a working 3G/4G/Wi-Fi connection to use Nalo app and you will be charged with our competitive rates. Nalo International: Wherever you are in the world you can make low cost international calls to any land line or mobile. Nalo to Nalo calls are free: Have all your friends and family install Nalo app and you can enjoy free international calls.