A:Answerno, location is piggybacked (securely) off other peoples apple products and then when you get close it uses your phone to pin down the exact location
A:AnswerIt’s my understanding that it’s only limited to cell service or access to other apple devices. I easily tracked a bag across the Denver airport and was able to retrieve it in the lost baggage area in a matter of minutes.
A:AnswerYes, The airtag will notify the nearest device and tell them they are being tracked or, an airtag (that isn’t theirs) has been around them for a certain amount of time.