hence free phone calls for many people until the phone systems changed. the most popular device to modify was a radioshack tone dialer, a simple solder of a 6.5536 mhz crystal was all it took and ...

RadioShack does not sell the pocket phone dialer anymore, but they do sell a DTMF chip (an NTE1690) that can do column D (the interesting bits that make all the phreakers happy).

Gone are the days of manually dialing phone numbers, busy signals and wait times. Organizations are transforming and transitioning to new technology using auto dialer software. Forbes Advisor has ...