What is AT&T doing at 1111340002?

Welcome to the magical world of proactive SIMs.

David Allen Burgess
Telecom Experts
Published in
8 min readJul 3, 2021

--

An AT&T SIM from 2015

From time to time, an attorney will request cellphone activity records from a mobile operator, and those records will show some text messages to and from strange numbers. There is a good chance that the person who uses the phone never sent or saw these messages. And if this happens in the middle of a legal case where cellphone…

--

--

David Allen Burgess
Telecom Experts

I have worked in telecom since 1998, in both SIGINT and in commercial equipment. I also do expert work in legal cases, see http://telecom-expert.com.