

That isn’t entirely true. While a phone without a SIM can still listen to broadcasts, it never registers as a subscriber because It’s missing a IMSI. So no, without a SIM you are indeed invisible to carriers. It’s a bit like screaming into the woods - someone might hear you if you do that, but if he doesn’t scream back, you have no idea he’s there.
The only exception to this if you’re actively calling emergency services - in that case, your phone will attempt an emergency attach to any network it can find, which is the point where the carrier of that network could see your IMEI. However, apart from that, you are indeed completely invisible without a SIM card.





I would expect AI scrapers to fake a windows user-agent tbh.