This is my first experience at a hotel using a mobile phone app as a keycard. It seems to transmit using BLE (Bluetooth Low-Energy).
Great for convenience, but I'm not sure how trustworthy it is, even though the permissions aren't egregious. I'll be disabling or uninstalling it until the next time I stay at one of these properties just to be safe.
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@voltronic
I somewhat am ok with the concept but only because I always seem to demagnetize my card multiple times during my hotel stays