There is a confusion at times with the term mobile marketing
Is Mobile Marketing Effective?

Our analysis suggests that rate of conversions are Ten times higher on a mobile phone than on a typical website landing page. Basically, this implies that if a potential customer calls you, they’re 10 times more inclined to purchase your product or service than when they just visit a webpage.
http://zackwenthe.com/marketing/is-mobile-marketing-effective
If you are looking at text/ sms market or just delivery to a handheld device any business should be gearing up to be available on any mobile platform.