Hilton and Starwood will soon allow guests to unlock their rooms via a smartphone app.

Starwood, owner of the Sheraton, Westin and “W” hotel chains, has upgraded 30,000 room locks in nearly 150 hotels so they can be unlocked with the new app.

Hilton is planning to enable guests to do the same thing in its 600,000 rooms next year. That hotel chain will begin by piloting a smartphone app at 10 U.S. properties in early 2015. Also, in early 2015, Hilton’s HHonors mobile room key app will be enabled at all U.S. properties of Conrad Hotels and Resorts.

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