A custom sender ID, also known as an alphanumeric sender ID, enables users to set a business name as the sender ID for one way organisation-to-consumer messages. This is only supported in certain countries and are up to 11 characters long, and support uppercase and lowercase ASCII letters and digits 0-9.[12] Senders aren’t allowed to use digits only as this would mimic a shortcode or virtual number that they don’t have access to. Reputable bulk SMS providers will check customer sender IDs beforehand to make sure senders are not misusing or abusing them.

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.  
Don’t forget to include your SMS marketing campaign as part of your overall marketing plan. Place a call to action on all of your marketing products, print and digital, inviting customers to join your SMS circle by texting a message or code to your phone number (in exchange for a discount, freebie, or other reward). This will help to broaden your customer base as well as increasing sales.
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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