A:AnswerNo, they are dependant on the phone, what you can do is ring the phone from the tile, you can even have other phones act as tiles, but they need their own accounts and for them to share their 'tile' (the phone in the app) so you can locate and ring it.
A:AnswerYes it’s free no matter what. I was in Sydney Australia and marked my tile lost at the airport because my bag didn’t arrive at the baggage area and it was found by another user in California airport. My bag didn’t make the plane.
