Mariott hotels began testing the smartphone based system which provides services such as check-in, room changes, rate confirmation and welcome information. All the guest has to do is fill in his/her information digitally on their smartphone and an automatic dispenser provides them with their keys. Read more at Gizmodo Mobile:
http://www.gizmodo.com/gadgets/smartphones/mariott-begins-tests-on-smartphone-checkin-194709.php