They are using another technology called NFC to control the door locks etc. It is not cellular like the APP is. Sort of like paying with Apple Pay but you open your doors and start your car or truck.
My wife’s 2020 Aviator has the “Phone as Key” feature. I imagine it will work it’s way to the Expy and trucks in a few years. My wife didn’t like it. She keeps her keys in a zipped pocket in her purse. If she forgets her purse will gabbing on the phone the car will not unlock. So she knows she left it somewhere.
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