I have a client in USA who wants to have a message sent to everyone's phone who passes his booth. From what I understand SMS spam is illegal and serious business if you get caught. I heard about proximity marketing by using a Blue Tooth device that will ask the person if they want to connect then you can send them a file. Obviously they need Bluetooth turned on so we can have a sign asking for that, but I haven't gotten a conclusive answer if this will work in the US. I saw a couple posts saying this wouldn't work on iPhones or Blackberries. Can anyone give me a concrete answer if this will work?