VoLTE may be coming to a market near you soon. Here’s an explainer to help you make sense of what it means, as well as what it doesn’t.

VoLTE: It sounds like “volt,” and it stands for “Voice over LTE.” T-Mobile just announced it was rolling out VoLTE technology out in Seattle, and AT&T’s set to follow with a similar rollout today for areas in Illinois, Indiana, Minnesota and Wisconsin. Verizon’s due to roll the technology out “later this year.” And MetroPCS launched the technology way back in 2012.

But what exactly is VoLTE?

Today’s LTE networks use something called packet-switching, as opposed to the circuit-switching used by older, slower networks. Think of circuit-switching as a highway reserved for a single vehicle from start to endpoint, whereas packet-switching’s more like a giant highway shared by all kinds of vehicles. Without getting into the weeds, LTE networks can’t do voice and data simultaneously: LTE conveys data no problem, but your voice calls actually have to run over the old circuit-switched technology.

Read the full article here.


Article by Matt Peckham, 23 for Time.