We can definitely provide you with some more information about these incoming text messages. These text messages are short codes. Short Codes allow customers to send and receive text or multimedia messages with shortened phone numbers. You can send and receive messages with short codes to access a wide variety of content from AT&T and other third party services. The service from which the short code originated from can be identified from the last five digits of the short code. You can Learn more about short codes and what the numbers represent here. Let us know if this helps.
Sean, AT&T Community Specialist
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