Hello @theatre ,
I think a few words got left out of your post, but from what I'm gathering you're confused on why your SMS send number is different from your company's number? When you register and are approved for SMS, you are given a dedicated phone number compatible with the SMS system. This number will be based off the number you provided for your support number when registering.
For more info on how the 10 DLC / dedicated SMS numbers, please see this article on SMS guidelines.
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