Yes. I just purchased an iPhone and they tell you as part of the setup that if you activate Find My iPhone or sign up for their emergency services, your phone w

Yes. I just purchased an iPhone and they tell you as part of the setup that if you activate Find My iPhone or sign up for their emergency services, your phone will continue to send and receive signals even when it is “off”, at least while the battery is not fully drained. I’m fairly certain that Find My iPhone works by other phones or devices scanning for Bluetooth MAC addresses. Before I turned the feature off my phone knew exactly where my Mac was without either being connected to Wi-Fi. The technology is seriously impressive but also deeply disturbing. I felt that Apple did a pretty good job of explaining the privacy concerns during setup, though.