Over the past few years SMS marketing 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 (MMA), 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 of the world, partly due to the carriers selling their member databases to third parties. In India, however, government's efforts of creating National Do Not Call Registry have helped cellphone users to stop SMS advertisements by sending a simple SMS or calling 1909.[5][6]
If your open rate is low, your goal will be to start improving that. If there are multiple parts of your message that you would like to improve, start with identifying the most important one. If, for example, your open rate and click-through-rate of the message’s contents are low, it would be better to first work on the open rate. After all, no one is going to see your improved content if no one is opening it in the first place. So, determine your goal and let that direct your focus towards the thing that needs improvement most.  
SMS messaging follows the rules of permission based marketing. It’s 100 percent opt-in based. Simply put, customers have to give their expressed consent before receiving SMS messages. This can be done in one of three ways. New subscribers can double opt-in¹ via web widget, add their cell number to a compliant sign-up form or text to join. The latter is the most common. After opting in, the new subscriber will receive an auto reply confirming their subscription. If the opt-in was accidental, they can simply reply STOP, and all messaging will cease.
These are dedicated memorable shortcode numbers which means that you’ll be the only company that uses the number, allowing it to become synonymous with your brand ensuring consistency and brand recognition. You can either purchase a random short code which means that an available short code number will be assigned to you, or you could opt for a vanity short code which means you get to choose the number you want to use.
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.
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