[flurdy]

From the volume of photos and videos from US, UK, etc that were based in Afganistan, Iraq etc you can deduce a smartphone is quite normal in those forces, so I would assume the same in Ukrainian forces.

They might not wear them out on patrol or manoeuvres, but back at their tents/barracks, I would assume some if not all have their personal phones. You only need a couple to track them.

I also read once Strave/Fitbit type trackers was rife at army bases and used to work out patrol routes.