Our international calling service is 100% free. Since our geographically distributed infrastructure connects directly with telephone companies, we offer crystal clear voice quality. PopTox has a direct carrier relationship with more than 1000 telco companies around the world. Enter the destination phone number using the dialpad.Download PopTox Apps How to make free international calls? With PopTox, you can make free phone calls to all mobile and landline numbers straight from a regular web browser. No need to go to iTunes or Google Play App store to download a calling app. Free Calling App by PopTox is world’s first web browser based app that does not require an app download.