News for hackers. Stuff that matters.

A comment on Tell HN: AT&T disabled phone numbers and accounts of users using the old phones. Parent comment

Re:Tell HN: AT&T disabled phone numbers and accounts of user... by p_l on Friday May 06, 2022 @07:06AM (#31283741)
IIRC - It's less voice over 3G and more voice over 2G but done on whatever radio interface you have. A question of using pre-IMS voice call interface vs. using IMS one (which was actually introduced with 3G, but first use for plain voice that most people have seen was WiFi Calling)
[ Parent | on HN ]
Re:Tell HN: AT&T disabled phone numbers and accounts of user... by username190 on Friday May 06, 2022 @11:00AM (#31285971)
AT&T shut down their GSM 2G network in 2017 - the remaining circuit switched calls were going out over UMTS (3G) until the shutdown.
[ Parent | on HN ]
Re:Tell HN: AT&T disabled phone numbers and accounts of user... by p_l on Saturday May 07, 2022 @04:34PM (#31298320)
The radio interface used is 3G/4G, but it still used circuit switching instead of IMS (which uses GPRS channel - just like your 3G/4G/5G data - and SIP, iirc)
[ Parent | on HN ]