https://www.nytimes.com/2023/01/04/world/europe/ukraine-russ...
> Ukrainian artillery targets Russian soldiers by pinpointing their phone signals. Despite the deadly results, Russian troops keep defying a ban on cellphone use near the front.
If you claim that neither Russian, nor Ukrainian special services are competent, I'd disagree with you.
It's especially critical to drip-feed feel good news when you losing.
> “It is already clear that the main reason of what took place included the massive use, contrary to the ban, of personal mobile phones in the range of enemy weapons,” the Russian Defense Ministry said in a statement. The cellphone data allowed Ukraine, it said, to “determine the coordinates of the location of military service members to inflict a rocket strike.”