Wardialing Modems Guerrilla Network Opensource Cyberspace [re: Tim May]

[grarpamp at gmail.com (grarpamp)]

ISDN modems were available in retail stores.
Anything above v.34bis (ex: v.92, digital lines),
required hardware, provisioning, and billing, at the CO.
v.34bis and below simply used the available analog
voice bandwidth (POTS), telcos resented that because
the tech was popular and outside their control,
but they did get to sell a lot more voice lines...
dialup BBS and Internet.

See...
https://en.wikipedia.org/wiki/Hush-A-Phone_Corp._v._United_States
https://en.wikipedia.org/wiki/Carterfone

ISDN was also fun for...
https://en.wikipedia.org/wiki/Caller_ID_spoofing

Telcos *still* ban and resent what their users want to do.

Which means some chance at profit still exists for
startups building their own neighborhood, local, regional,
etc fiber and wifi networks.