As the citation above shows, this metaphor is based on the humble telephone dial tone, a service that provides easy and near-universal access to the phone system, and that works with a wide variety of devices (telephones, modems, security systems, and so on).
Another "dial tone" example that hasn't quite made it out to the mainstream media, but that's making the rounds of e-book and e-publishing circles is "content dial tone":
"The amount of Internet content will grow 'tenfold' over next 3 years, IBM Vp-Global Media Mktg. Steven Canepa said, and much of growth will be in streaming audio and video. He said content would be available to 'pervasive devices,' starting with Palm units and Web-enabled phones, and extending eventually into even more exotic devices. Successful services will provide 'content dial tone, Canepa said, offering 'whatever you want, where you want it, and using the device you want to use.'"
—Communications Daily, April 13, 2000
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