The PSTN, public switched telephone network, is the global circuit-switched system built over a century: copper pairs to every building, switching offices in every town, and the dial tone that survived blizzards. It still exists, but in the United States it is being deliberately wound down. Carriers have been granted permission to retire copper infrastructure, and they are using it, region by region.
Why carriers are walking away from copper
The economics stopped working. Copper plant is expensive to maintain, the technicians who service it are retiring, the equipment vendors have moved on, and the subscriber base collapsed as households went mobile and businesses went VoIP. In 2019 the FCC (in orders often summarized as USTelecom forbearance) relieved major carriers of long-standing obligations to keep offering legacy copper services at regulated rates, and formal retirement filings have rolled forward ever since. New neighborhoods frequently are not built with copper at all.
What actually happens in a retirement
Carriers file to discontinue service in an area, notify affected customers, and migrate lines to alternatives: fiber, fixed wireless, or VoIP-based replacements. Customers who do nothing typically get moved to a carrier-chosen substitute or lose the service at the deadline. The letter that starts this process is easy to mistake for junk mail, which is how businesses end up surprised.
Who this actually affects
- Businesses still running phone service on analog copper lines, obviously, but they usually know it because the bills are large.
- The sneaky category: copper lines nobody thinks about because no human talks on them. Alarm panels, elevator phones, fire communicators, gate systems, and fax lines are frequently the last copper in a building, and the retirement letter affects them most. That situation has its own guide: alarm panels and elevator lines after copper.
- Anyone whose disaster plan assumed "the landline will still work." The continuity guide covers what replaces that assumption.
What to do about it
Inventory every copper line your business pays for, including the ones buried in facilities invoices, and identify what each actually does. Voice lines migrate cleanly to VoIP, and numbers port regardless of technology. Special-purpose lines need purpose-specific replacements, cellular communicators for alarms, code-compliant solutions for elevators, before the deadline chooses for you. The worst plan is discovering which line mattered by watching what breaks.
If your business gets a service-discontinuance notice, treat it as a project start date, not junk mail. The dates in those letters are real, and the default outcomes are chosen by the carrier, not by you.
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