FWIW smartphones are nearly universally used in Ukraine by both sides because too much useful stuff runs on them. Artillery calculators, for example. Russians

FWIW smartphones are nearly universally used in Ukraine by both sides because too much useful stuff runs on them. Artillery calculators, for example. Russians also use theirs for actual comms a fair bit because their equipment (like older tanks from storage) often lacks encrypted digital radios, or sometimes any working radios at all. Ukrainians invested heavily into DMR after the Donbas war in 2014-15 where they had similar troubles.