BMW already allows you to unlock some of its cars with your iPhone, but the automaker is looking ahead to an even more ambitious version with BMW Digital Key Plus. Set to launch on the BMW iX all-electric SUV, the new system will be based in Ultra-Wideband (UWB) rather than just Bluetooth and NFC, to throw positional data into the mix.

The current BMW Digital Key allows you to use your iPhone as a virtual key for your car.
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https://www.slashgear.com/bmw-will-debut-uwb-digital-key-plus-with-ix-all-electric-suv-14655176/