The app will also show you upload and download speeds, which both should be at least 2Mbps or higher for the best results. It’s also important to test repeatedly to see if the latency number has huge swings, which will mean your call quality is likely to go in and out. Generally speaking, if the latency is 150 or higher, you can expect to have problematic Wi-Fi calls. When you tap the speed test button, the first thing it will do is test the latency of your connection. If you want to make sure you’re only on the Wi-Fi network, put your phone into Airplane mode and connect only through Wi-Fi. When you open the app, it will tell you at the top how you are connected, so be sure it shows the Wi-Fi connection that you want to test. There are many apps for measuring the quality of a Wi-Fi connection but the one I like to use is called Open Signal because it’s very easy to use. The higher the number, the more likely that your Wi-Fi call will experience things like dropouts, echoes and poor voice quality especially for the person on the other end. Latency is a measurement of how long it takes for a packet to get to its destination, so think of it as a measure of delay. There is a measurement known as latency that plays a big role in whether your phone conversation is clear or full of crazy interruptions. If these packets don’t get delivered consistently, your call quality will suffer.
Unlike a cellular call, which uses radio frequencies, Wi-Fi calling breaks up your voice into “packets” that get sent over the Internet. It’s very similar to VoIP (Voice over Internet Protocol) services such as Skype and Google Voice in that it uses the Internet to transmit your voice.
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