I realise the thread is phone phreaking related and that was kind of the point of your post; but in the spirit of the talk below to think more outside the box..

I realise the thread is phone phreaking related and that was kind of the point of your post; but in the spirit of the talk below to think more outside the box... There's a pretty good chance in many cases you can just open the external box with some easy to get (and relatively standard) key. And hit a button. Related: https://twitter.com/MalwareTechBlog/status/903823478167527424 https://twitter.com/MalwareTechBlog/status/90382347816752742... This is a good related talk - goes outside the box on all the ways you can often get into commercial buildings without picking (or even in many cases, interacting with) the lock "The Search for the Perfect Door" by Deviant Ollam https://www.youtube.com/watch?v=4YYvBLAF4T8 https://www.youtube.com/watch?v=4YYvBLAF4T8 Also good: https://www.youtube.com/watch?v=a9b9IYqsb_U https://www.youtube.com/watch?v=a9b9IYqsb_U [Howard Payne & Deviant Ollam - This Key is Your Key, This Key is My Key] https://www.youtube.com/watch?v=oHf1vD5_b5I https://www.youtube.com/watch?v=oHf1vD5_b5I [DEF CON 22 - Deviant Ollam & Howard Payne - Elevator Hacking - From the Pit to the Penthouse]