A:AnswerOther iPhones will know that a air tag is nearby but not that it is your air tag. I was at my sister's house and her iPhone notified her that there was a air tag in her house. That is to keep someone from putting an air tag in your personal item without you knowing it.
A:AnswerIt can't; AirTags are only compatible with Apple devices. At this time we haven't heard of Apple planning to make them compatible with Android devices.
A:AnswerIf you choose "play sound" on the Find My app it will. It will also make noise if it thinks that it's being used as a tracking device (eg. if an Apple device that isn't registered to the AirTag is detected to be with it.)
