Google While UWB and NFC might make a digital car key on your phone more secure in some ways than a simple fob, that doesn't mean using your smartphone as a key is free from risk. In fact, adding your car keys to your phone makes losing it even riskier. If you don't have adequate security measures set up (like using a weak passcode, for example) it's that much easier for someone to access your car if they steal your phone. Relying on your smartphone over physical keys might also cause problems if a software issue prevents you from using Google Wallet or, God forbid, you lose your phone.
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