Great article I found on ezince artiles by: YK Hu 

With the advent of mobile phones, people tend to be used to having received and sent information in just a few minutes. Having this tool on hand, people have already utilized it as a marketing strategy and it has become more common in this generation. What is really meant by mobile marketing? As others described it in a simple way, it is marketing through the use of mobile devices. One best example of that is cellphones. Almost all people all over the world have cellphones so access to it is very easy. This kind of medium is utilized as a way of marketing communication, such as informing the people about a promotion or it could be advertising a new product. Have you ever wonder why Short Message Service (SMS) marketing has been widely popular in Europe and Asia? Why do entrepreneurs prefer to use it? The main reason of this is due to the fact that it is cheap and effective since a large number of SMS can be sent to a number of recipients and in a matter of a few minutes these people can already respond to the advertisement or announcement. In this way, the company has already saved cost because they have already sent the desired message to their target market. There are a lot of ways wherein this marketing strategy is used. One example is building a relationship between the mobile users to the company since the customers can register to the advertising company so as they can be contacted and can receive regular message from the advertisers regarding any new announcements and promotions. This is a win-win relationship because both parties are benefited. However, despite the benefits it provides to many people, others still have a negative feedback on it. Although almost all people use mobile phones some of them don't like to receive promotional messages from advertising companies for they have the notion that their phone is something very personal. Also, businesses find SMS marketing non-appealing because of the problems encountered from the opt-in SMS lists. Aside from SMS Marketing, there are still other streams of mobile marketing. A multimedia message service (MMS) marketing is also used which is more advanced than SMS because its content can include images and sounds. Still, it is similar to SMS marketing. Other streams include Bluetooth marketing which sends messages through Bluetooth wireless technology. You also have what you call infrared marketing which transmit announcements and advertisements through infrared.