While the use of smartphone hotel keys is becoming increasingly popular among hoteliers of all levels, a hotel in Seoul, South Korea, has taken it up a notch, Hotel Chatter reports. Its developer, LG CNS, calls it "Smart Guestroom Service."

The smartphone keys at the Hotel Skypark Central allow guests to control their guestrooms remotely. The downtown-Seoul inn also will lend guests a loaner phone. According to LG CNS, this is the first hotel to tap into the technology. So, the home-control service that is in residences now is coming to hotels too.   

The devices do just about everything, aside from calling home (actual phone services aren't available; unless you use Skype, of course), such as unlocking and locking your door, ordering room service, turning on the lights, channel surfing on your flatscreen, and browsing the web.