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It doesn't work that way. iPhones NFC chips are still powered even if the phone battery dies. That's how transit cards work even when the battery is dead. http

• Marsymars 7y ago
  That's better than nothing, but that doesn't describe "NFC works with dead phone", that describes "phone reserves up to five hours of emergency battery power for only NFC use". When my current car fob starts displaying a low battery warning I have at minimum weeks to replace the battery. (Not to mention my current car fob is resistant to being dropped, stepped on, etc.)
  • ronnier 7y ago
    Then carry a key fob with you. Nobody will stop you.
  • daveFNbuck 7y ago
    5 hours gives you plenty of time to plug your phone into your car and charge it. My fob doesn't give me a low battery warning. I find out the battery died when I can't use the fob to unlock the car.
    • Marsymars 7y ago
      > 5 hours gives you plenty of time to plug your phone into your car and charge it. As long as the scenario is "phone battery died within five hours of needing to drive car".
      • daveFNbuck 7y ago
        I've never had my phone die more than 5 hours before needing to drive. I have had my fob stop working without warning. So this would be a good improvement for me.