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If the phone is switched off (not just on standby etc) they can't do anything at all, because there's no power.
If the phone is on and pinging local stations then they know where you are, certainly, otherwise they wouldn't be able to send you information. But let's not compare apples to oranges here. It's easy to turn a phone off or remove the battery, it's not yet compulsory to have one and the information isn't automatically tied into government databases like that from an ID card would be. And you can always buy a PAYG SIM from some guy on a market stall that's not tied to you at all.fridgemagnet, 13 years ago.