The Holiday Inn chain of hotels is to start experimenting with a technology to allow customers to unlock their rooms using their smartphones, rather than a traditional key card.
According to USA Today, the InterContinental Hotels Group will start the trial from next month in two of its US Holiday Inn hotels: the Chicago O'Hare Rosemont and the Holiday Inn Express at the Houston Downtown Convention Centre.
Sounds nice and convenient, but if a stranger busts into your room holding a Blackberry or iPhone you will know why.