This allows people to text a custom keyword to a dedicated virtual number or shortcode. Through custom keywords, users can opt-in to a service with minimal effort. Once a keyword is triggered, an autoresponder can be set to guide the user to the next step. They can also activate different functions, which include entering a contest, forwarding to an email or mobile number, group chat, and sending an auto response.
If you’re working with CM.com’s platform, use the Address Book to randomly divide your recipients into two marketing groups. Create two separate campaigns, one for version A and one for version B. Keep everything in the campaigns the same except for the element you want to test. Set up your message, implement the changes in version B, randomly add one of the recipient groups to campaign A and add the other to campaign B. Send your message, and wait for the results to come in.  
Similar to email, SMS has anti-spam laws which differ from country to country. As a general rule, it’s important to obtain the recipient’s permission before sending any text message, especially an SMS marketing type of message. Permission can be obtained in a myriad of ways, including allowing prospects or customers to: tick a permission checkbox on a website, filling in a form, or getting a verbal agreement.[16]
In order to gain their mobile number, they will have to have a great deal of trust in you and a pre-existing relationship will help. They also need to know that what you'll be sending them via SMS message is exclusive offers, not the same offer that you give via email and social media. Be clear with your customers and use the following guidelines when introducing SMS marketing to your customers:
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