Most businesses don't replace their POTS lines because they think it's cheaper to wait. The math says otherwise.
I've run the numbers on hundreds of deployments at TrustedNetworx, and the pattern is consistent: waiting costs more than acting. Every single time.
The sticker shock is real — and misleading
A single POTS line from AT&T or Verizon runs $60–$90 per month depending on your market. Add a second line for redundancy (required by most fire and elevator codes) and you're at $120–$180. That's per location. A 50-site property portfolio is burning $6,000–$9,000 per month just to keep copper alive.
A wireless POTS replacement device like the DataRemote 90X2 costs roughly $15–$25 per line per month. That same 50-site portfolio drops to $1,500–$2,500 monthly.
The savings: $4,500–$6,500 per month. That's $54,000–$78,000 per year. From day one.
The rate increases you don't see coming
Carriers are actively discouraging POTS customers. AT&T has filed in multiple states to sunset copper, and when they can't disconnect you, they raise the rate instead.
We've seen clients hit with 15–20% annual increases on POTS lines with zero notice. One healthcare client saw their per-line rate jump from $72 to $98 in 18 months. Another saw an $11 "copper maintenance surcharge" appear out of nowhere.
The carriers are sending a message. The question is whether you'll act on it before your budget forces you to.
What a truck roll actually costs
Here's a cost nobody budgets for: the service call.
When a POTS line goes down — and they do, constantly — you're looking at a 4–8 hour carrier dispatch window. If you're a property manager with tenants, that's angry phone calls. If you're a healthcare facility, that's a compliance event. If you're a retailer, that's lost transactions.
A single truck roll that takes a POS terminal offline for four hours at a busy location can cost $2,000–$5,000 in lost revenue. One incident pays for months of wireless replacement service.
Wireless replacements don't need truck rolls. Remote diagnostics handles 90% of issues. The other 10% is a device swap that takes 10 minutes.
The compliance clock is ticking
If your POTS lines serve fire alarms, elevator phones, or security systems, there's a compliance dimension to the math.
NFPA 72 and UL 864 now recognize cellular as a primary communication path. The 2019 edition of NFPA 72 explicitly allows wireless — no grandfathering required. But you have to make the move. Carriers won't do it for you.
An AHJ citation for non-compliant fire alarm communications isn't theoretical. We've seen fines ranging from $500 for first offenses to $5,000+ for repeat findings. That's on top of whatever remediation you have to rush-order.
The payoff timeline
For a typical 25-line deployment:
| Cost Factor | POTS (Monthly) | Wireless (Monthly) |
|---|---|---|
| Line charges (25 lines) | $1,875 | $500 |
| Maintenance/truck rolls | $300 (avg.) | $0 |
| Rate increase risk (15% YoY) | +$281 | +$0 (fixed contract) |
| Total | $2,456 | $500 |
Monthly savings: $1,956. That pays for new hardware in under 90 days. Everything after month three is pure savings.
The real cost of waiting
Let's say you delay six months. At $1,956 in monthly savings left on the table, that's $11,736 you'll never get back. Add in the near-certainty of a rate increase during that window and you're closer to $13,000.
For 100 lines across an enterprise? You're throwing away $50,000+ by waiting six months.
The numbers don't get better with time — the gap widens as carrier rates climb and wireless costs stay flat or decline.
Bottom line
POTS replacement isn't a cost. It's an investment with a sub-90-day payback and an ROI that compounds monthly. Every day you wait, you're paying your carrier to keep infrastructure they don't want to maintain, at rates they're actively increasing.
About the author
Carter Dewey
Carter Dewey is CEO & Founder of TrustedNetworx, helping multi-site organizations navigate telecom modernization, POTS replacement, and AI-powered operations — translating complex infrastructure challenges into practical, phased migration roadmaps.