How fast does my mobile internet need to be to handle VoIP calls on my smartphone?

With a strong wireless 4G LTE connection, your smartphone can handle calls with HD call quality. It’s less about the speed, but the variance in network latency—often called jitter.

In most cases, a 3G signal is sufficient for a satisfactory VoIP call. In cases of weak cellular signal, you may opt for a stable Wi-Fi connection instead.