When President Dwight D. Eisenhower retired in 1961 it was nearly universal, but the president himself had not been confronted with a dial tone.
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Invented by an engineer, August Kruckow, the dial tone was first used in 1908 in Hildesheim, Germany.
Dial M for Murder | Dial Corporation | Dial Press | Franchot Tone | Tone Lōc | Tone | River Tone | Ringback tone | In a Mellow Tone | Dial House, Essex | Dial H for Hero | Yasunao Tone | Wolfe Tone | Wild Thing (Tone Lōc song) | Tony! Toni! Tone! | Tone River | tone (linguistics) | ''Tone'' | tone | Rotary dial | Muscle tone | Dial House | Dial | Webern's ''String Quartet'' Op. 28 tone row, composed of three tetrachord | Tone Soul Evolution | tone row | Tone Mason | Tone Dale House | Tone Åse | rotary dial |
The third season DVD contains a number of deleted scenes from this episode, including Karen pulling a prank on Jim by setting his dial tone to call Hong Kong, Andy comparing his jumping skills to Michael Jordan to Jim, Michael asking Pam how she is holding up since the wedding broke off, and Jan being furious at Michael.