Cell Phone Anti-tracking Anti-spying GPS Rfid Signal Blocker Pouch Case Bag Handset Function Bag (Black) High quality and perfect design, can be used as a wallet at the same time Anti-radiation, anti-degaussing, anti-signal. Be sure to put the phone in back pocket, not the front pocket , then close the bag, and the signal will be blocked Prevent people from being tracked with this bag, protect your privacy If you don't want to answer the phone, you can put the phone in the bag,then the phone will tell "Calls can not be connected." ID card,bank cards such as IC magnetism card into the bag, it can aviod magnetism lost and information leak