Yolla

Yolla is an app that allows you to make calls to other countries at a reduced cost. The price of international calls varies greatly from one operator to another, so with Yolla, you can call and send messages while knowing at all times what you're going to pay.

To use Yolla, you need to enter your real phone number. After that, a verification call will be made to give you a four-digit code that you'll have to enter into the app. After waiting a few seconds and completing this verification, you can start using the app. You also have the option to add your email address in order to view a monthly summary and invoice.

To load credit, you can choose between adding $4, $8, or $16. You can charge it using a credit or debit card, PayPal, or your Google Play balance. In addition to using the credit for your calls, you can also send credit to friends and family so that they can call you. Likewise, you can send SMS as well as make calls via Wi-Fi to save even more money.

Yolla also offers a paid VPN service, which allows you to surf safely and anonymously anywhere in the world.