Unzip the contents of the download from this page into a folder on your computer Turn on Harrier Pocket PC (or your Pocket PC Phone Edition CDMA) Start Harrier and run 'WModem', select USB, press ...

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).