Phone phreaking, the 80’s were so fun. Stolen AT&T calling card numbers enabled you to call long distance for free at a time when calling the next city over could cost 30 cents a minute or more (equivalent to over a buck now). Hacking people’s answering machines was pretty easy. For youngsters, this was a device hooked up to your land line phone to give you voicemail. You could listen to your messages remotely by calling it and entering a password which was very short and limited to numbers. Some had to the capability to change the message that answered the phone. That made for lots of fun