If you're a journalist who used AT&T between May 1-October 31, 2022, you're going to want to revisit your call and text history from that time and see which of your sources you were communicating with. These records have been improperly secured by AT&T. https://www.usatoday.com/story/tech/2024/07/12/att-data-breach-who-affected-what-to-do/74379292007/
How to know if you were affected by the AT&T data breach and what to do next

AT&T said Friday the call and text message records of nearly all of its cellular customers were exposed in a data breach. Here's what we know.

USA TODAY
The AT&T breach underscores the importance of being mindful of call and text metadata — something Signal handles much better than traditional phone calls and texts. Unlike your telecom provider, Signal doesn't retain logs of your calls and texts on their servers. Your activities are stored on your device and with anyone you speak to. https://freedom.press/training/signal-beginners/
Signal, the secure messaging app: A guide for beginners

How to get started using Signal, the encrypted messaging app.

Freedom of the Press