I warned the UK govt about this in 2016
I used to work for ‘a leading supplier of satellite cellular backhaul systems. Back around 2016 when the UK was negotiating to replace the (still extant) Airwave system used for emergency services with a 4G network I warned various parties that unless they used true end to end IPSec, not just on certain links that the traffic could be compromised. But guess what - they chose a cheaper but compromised system! Surprise!