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Downed Russian Shahed Drone Was Found With a Ukrainian SIM Card: Think Tank
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I dont think you can determine altitude solely from a cell signal
It's physically possible, though depends on if the receivers care about the vertical signal direction (for determining up) and if two towers can see it at the same time (for determining how high up, if signal quality alone isn't enough to estimate it, though with these custom devices, it's probably not reliable to go by signal strength). I don't know if any go to that length, inside Ukraine or outside.
Just need 3 recievers on the ground, time synced oc, and you can find 3D position of the transmitter.