The phone does not need to be unlocked, and no app is required—but the screen must be lit up (awake) for the antenna to scan.
iPhone (XS or newer): Tap and hold the fob flat against the very top back edge of the phone, right next to the camera bump.
Android / Pixel: Tap and hold the fob against the dead center of the back of the phone.
Within 1 second, a banner drops down from the top of the screen. Tap it to open the live contact dossier or emergency profile.
Every Clandestine fob uses ferrite-shielded silicon so steel keyrings never block your signal. Zero apps, zero batteries, and zero monthly subscriptions.