In theory, they’re supposed to have custom-made secure phone with built-in cryptography, a famous example would be modern Police walkie-talkie which practically speaking are using a protocol closer from (legacy) mobile phone than from radio.

The problem is that it’s 2025 and not 1995 anymore. When it was about A mobile device which can carry voice and short text message A custom device would be a bit more bulky and expensive. But today, when smartphone are mini-computer with tons of cool feature, and that people are used to have group-chat, touch screen, visual call. Sudently a custom-device feels like back in 2005. And here is the problem, most high level politicians aren’t cryptography nerd or Military/Intelligence officer understanding how to be discrete, they’re marketing and communication people who love these fancy UI, and need to show off.