VoIP stands for Voice over Internet Protocol. It is the technology that turns a voice call into data packets and sends them over an internet connection — the same way an email or a web page travels. When the packets arrive at the other end, they are reassembled back into audio. The person you are calling hears your voice in real time.
This is not new technology. Your NBN provider almost certainly already uses VoIP to deliver your home phone line — the phone socket on your NBN box works this way. The difference with a kids WiFi phone is that the device connects wirelessly to your home router rather than through a cable, and the parent controls a whitelist of who can be called.
From your NBN connection's perspective, a VoIP call from a kids phone looks identical to any other small amount of internet traffic. It uses roughly the same data as loading a single webpage — but spread across the duration of the call. A 10-minute call uses less than 5 megabytes of data. On any standard Australian NBN plan, this is negligible.
The critical point for parents: connecting to WiFi for calls is not the same as having internet access. Yaps connects to your WiFi network to make voice calls. It cannot use that connection to browse, stream, download, or access any website or app. The WiFi is the pipe — but the device only uses it for one purpose.
