This question exists for many. First, NEVER EVER purchase a list of mobile numbers. (SMS/MMS) marketing is permission based, and ultimately you want a list of customers numbers who are genuinely interested in your product or service and are happy to receive your text message and are likely to buy your goods and service. Remember, you can turn customers off and possibly upset a lot of your potential customers when sending text messages on their mobile devices without their consent.
In a nutshell, mobile devices are arguably the most personal items we own and as (SMS/MMS) marketer building your phone number database in the early stages of your (SMS/MMS) campaign, you need to let subscribers know what they are opt-in for. keep your promise and send only infrequent, valuable text messages. Remember to keep delivering value through incentives and your customers will stay opted-in and very eager to receive your next text.
Trulia reduces the time it takes to respond to online leads. The odds of successfully contacting an online lead are 100 times higher if the lead hears from an agent within five minutes of submitting an online form. With programmable voice and SMS, real estate agents are instantly connected on a call with a new lead, or sent an SMS with lead details.
MMS mobile marketing can contain a timed slideshow of images, text, audio and video. This mobile content is delivered via MMS (Multimedia Message Service). Nearly all new phones produced with a color screen are capable of sending and receiving standard MMS message. Brands are able to both send (mobile terminated) and receive (mobile originated) rich content through MMS A2P (application-to-person) mobile networks to mobile subscribers. In some networks, brands are also able to sponsor messages that are sent P2P (person-to-person).
In the article cited at the beginning of this post, the author boldly claims that “a major chunk of the population is already registered with the DND.” First, there is no clear statistical research backing up this assumption. Second, in the U.S., the Do Not Call registry protects consumers from just that — unwanted calls. It’s designed to prevent telemarketers from harassing consumers. This has absolutely nothing to do with text messaging. Now, if for some reason you do find yourself receiving unwanted text messages, you can file a complaint. But, knowing the permission-based nature of this marketing method, you may never confront this issue.
Once you've collected your mobile numbers, verified that you have followed all of your legal responsibilities you can start your SMS marketing campaign. I'd suggest using a 3rd party service provider to ensure that you are able to track the return on investment for your campaign, embed an unsubscribe message, and easily manage your SMS marketing database including unsubscribes. 
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