Text U Now - Second Phone Number is the best app for making cheap international calls over Wifi, 3G, or 4G data networks without using any cell minutes.

Text U Now - Second Phone Number allows you to make free international calls to landlines and mobiles in over 200 countries. The best part is that you don't need to use any cell minutes to do so. All you need is your WiFi, 3G, or 4G data network, and you can start making calls immediately.

There are no hidden fees or registration required, and you will never need to pay to make calls. It also allows you to display your phone number or caller ID.

The app allows you to earn free credits by checking in daily or watching a video.