Russian Soldiers Using SIM cards on the Ukrainian Network Reveal Troop Concentrations Exactly.

https://twitter.com/TrentTelenko/status/1524743911817850881

The information dates from the endof March.   Russian SIM cards inserted into stolen Ukrainian phones. Besides being out of date, this is complicated since there are areas where cell towers have been knocked down and it looks like the Crimea has a Russian cell service.  It also points to areas that are "captured" but are not controlled.  One commenter says the soldiers won't give up their phones to officers because the officers will steal them too.