Just found an article from http://www.computerworld.com,which I think it is quite interesting and worth to read. Will WiFi overtake Bluetooth in mobile phones? Below is the whole article:

Introduction
Mobile marketing is a new area in interactive marketing. It has a great opportunity as people often own a cell phone all the time. It is a broad channel which includes SMS, MMS, mobile internet, applications, location based services and Bluetooth marketing.
Mobile marketing is growing rapidly. Marketers are using this in various areas, such as: