The app is available at 31 hotels in the United States and Canada. By the end of the summer, the app will expand to all 328 Marriott Hotels, which the hotel brand claims is the broadest mobile application of its kind in the U.S. and Canada. “We’ve had mobile bookings since the end of 2010, and our guests have told us they want to engage with us during their stay, so we’re now adding mobile check-in,” said George Corbin, senior vice president of digital at Marriott International, Bethesda, MD. “We plan to evolve and add other services.” To use the Marriott Hotels app, guests must check-in after 4 p.m. the day before their reservation or up to two hours before arrival. When guests get to the hotel, they can go to a Mobile Check-In desk and immediately receive their pre-programmed key card. Get the full story at Mobile Commerce Daily