Voice-Over-LTE: The Reason Why Your Phone May Soon Stop Working

Although wireless standards like 3G, 4G, and 5G are mostly associated with mobile internet, they also include a phone (voice) component. Up till 4G this was done using traditional circuit-switched telephony service, but with this fourth generation the entire standard instead moved to a packet-switched version akin to Voice-over-IP, called VoLTE (voice-over-LTE). Even so, a particular phone can choose to use a 4G modem, yet still use 3G-style phone connections. Until the 3G network is shutdown, that is. This is the crux of [Hugh Jeffreys]’s latest video.

This is a companion discussion topic for the original entry at https://hackaday.com/2023/11/27/voice-over-lte-the-reason-why-your-phone-may-soon-stop-working/