App to Phone Calling is a communication method to allow smartphone apps to call a regular landline or cell phone numbers.
This takes advantages of data calling, using 3G/4G networks or Wi-Fi, and PSTN calling (public switched telephone network) which connects modern phone numbers. The PSTN network is the telephone network that connects national, regional and local phone numbers.
App to Phone Calling does this by initiating the call, and uses VoIP technology to connect to a cell phone number on a PSTN network. This means a smartphone app can call a cellphone without using the standard calling dialer on the device.
What is great for app developers is that by mixing data and PSTN calling, apps can make low cost international phone calls straight from the device, calling across the world for a fraction of the cost of standard roaming and international calling charges.
More and more major apps are starting to use App to Phone Calling in their apps. Big names like Line, Skype, Viber and Rebtel are letting users call across the world for a much lower price than regular phone networks and operators, all from within their app.
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