"Pocket Dial integrates the Windows CE contacts database with touch tone dialing [...] You simply hold the receiver of your phone near your H/PC’s speaker, and your H/PC will generate the tones needed to dial. Nifty features include [...] prefix rules (long distance, area code, access numbers, etc.)."
TIL "Blue Box" style tone generators still have a practical use in the modern day: auto-dialing on a POTS phone.

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