If you connect to the wrong tower, can’t they get IMEI info? That won’t include OS, but it will give phone model/mfr and other details. I remember reading about regional police forces or intelligence agencies gathering data in North America at least (and they were explicitly gathering personal & usage data too, to see if they could find criminals supposedly).
We all like to joke about cats leeching but they’re definitely not Capitalist. They’re hunter gatherers for whom the concept of hoarding resources doesn’t exist. To them, when there’s plenty, you vie for it all within the social group (seems there are hierarchies?) and no one has to go hungry and there’s no waste (including wasted energy). This also preserves plenty of leisure and social time.
If raised in an environment where it makes sense to hunt and you encourage them to do so, they’ll happily contribute what they believe to be palatable food. If left alone, reasonably fit cats can fend for themselves too if necessary.
They’ll take what shelter they get and bury their waste so it can fertilize the ground.