Of note is that even if the Steam wasn't breached, but instead a 3rd party service, those numbers are still compormised.
        this post was submitted on 15 May 2025
        
      
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    The phone numbers I guess kind of have been, but they don't seem to be linked to an account, and the codes are useless. I think at worst people with those numbers might need to prepare for focused phishing attempts to get more info from them.