What is AT&T doing at 1111340002?

That is what SIM expert David Allen Burgess asked when he found secret records of phone activity that the user had no idea about. 

Welcome to the magical world of proactive SIMs - SIM cards that send data off your phone without you or your phone's operating system knowing. 
There is no public documentation about these messages, there's no way to see all the information in the messages, and the cell companies won't talk about it. 

Are SIM cards more vulnerable than we'd thought?

Huge thank you to David Allen Burgess for his time and expertise! You can read his original report here:
https://medium.com/telecom-expert/what-is-at-t-doing-at-1111340002-c418876c212c

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