You can now enter your room with your iPhone at certain Starwood hotels
Certain Starwood Hotels have begun rolling out keyless room entry for Starwood Preferred Guests, a program first announced early this year. SGP Keyless allows guests to open their room through their phone, and at some point next year, the Apple Watch. The program is starting at three hotel brands, Aloft, Element, and W. Guests will be sent a Bluetooth key specifically for their room to the SPG app before arrival, allowing them to bypass standard check-in, according to Starwoods' press release:
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