Find My iPhone (FMI) is Apple's activation lock. ON = device is tied to an Apple ID and cannot be activated. OFF = clean and ready to use or unlock.
CLEAN = not reported lost or stolen. LOST = owner flagged it missing — activation will show a Lost Mode lock screen.
Identifies model, carrier region, warranty status, and KG/Knox lock state from the IMEI TAC code. Useful before buying second-hand.
Dial *#06# — IMEI appears instantly. Also in Settings → About Phone, or printed on the original box/SIM tray.