I think this is pretty interesting but has very limited applications / viability. There are so many other better ways to eavesdrop its sort of not worth the effort.
vxvrs 8 days ago [-]
This one is a few years old, but still thought the attack itself is highly interesting
Edit: looks like 2020 from this previous thread?
Eavesdropping Encrypted LTE Calls With ReVoLTE - https://news.ycombinator.com/item?id=24129977 - Aug 2020 (14 comments)