Mobile marketing can refer to one of two categories of marketing. First, and relatively new, is meant to describe marketing on or with a mobile device, such as a mobile phone (this is an example of horizontal telecommunication convergence). Second, and a more traditional definition, is meant to describe marketing in a moving fashion - for example - technology road shows or moving billboards.

Marketing on a mobile phone has become increasingly popular ever since the rise of SMS (Short Message Service) in the early 2000s in Europe and some parts of Asia when businesses started to collect mobile phone numbers and send off wanted (or unwanted) content.

Over the past few years SMS has become a legitimate advertising channel in some parts of the world. This is because unlike email over the public internet, the carriers who police their own networks have set guidelines and best practices for the mobile media industry (including mobile advertising). The IAB (Interactive Advertising Bureau) and the Mobile Marketing Association, as well, have established guidelines and are evangelizing the use of the mobile channel for marketers. While this has been fruitful in developed regions such as North America, Western Europe and some other countries, mobile SPAM messages (SMS sent to mobile subscribers without a legitimate and explicit opt-in by the subscriber) remain an issue in many other parts or the world, partly due to the carriers selling their member databases to third parties.

Mobile marketing via SMS has expanded rapidly in Europe and Asia as a new channel to reach the consumer. SMS initially received negative media coverage in many parts of Europe for being a new form of spam as some advertisers purchased lists and sent unsolicited content to consumer's phones; however, as guidelines are put in place by the mobile operators, SMS has become the most popular branch of the Mobile Marketing industry with several 100 million advertising SMS sent out every month in Europe alone.

In North America the first cross-carrier SMS shortcode campaign was run by Labatt Brewing Company in 2002. Over the past few years mobile short codes have been increasingly popular as a new channel to communicate to the mobile consumer. Brands have begun to treat the mobile shortcode as a mobile domain name allowing the consumer to text message the brand at an event, in store and off any traditional media.

SMS services typically run off a short code, but sending text messages to an email address is another methodology. Short codes are 5 or 6 digit numbers that have been assigned by all the mobile operators in a given country for the use of brand campaign and other consumer services. The mobile operators vet every application before provisioning and monitor the service to make sure it does not diverge from its original service description.

Besides short codes, inbound SMS is very often based on long numbers (international number format, e.g. +44 7624 805000), which can be used in place of short codes or premium-rated short messages for SMS reception in several applications, such as product promotions and campaigns. Long numbers are internationally available, as well as enabling businesses to have their own number, rather than short codes which are usually shared across a number of brands. Additionally, long numbers are non-premium inbound numbers.