The short answer
Managed POTS replacement typically costs $70 per month for an eight-line device on a wired circuit ($90 with 5G/LTE), plus a $20 SIM, management per device and about $4 per line for phone numbers and the voice platform, with a one-time $249 install per site. At eight lines that is roughly $138 per month, about $17 per line, against copper lines that commonly bill $75 to $150 each.
The three cost components
- Managed hardware: $70 per month per eight-line box on a wired circuit, or $90 with 5G/LTE transport, including replacement hardware
- Connectivity, numbers and management: $20 cellular SIM and 24/7 management per device, plus about $4 per line for phone numbers, porting and PSTN termination
- Install: $249 one time per site, waived on 36-month terms above ten lines
Cost at common line counts
Efficiency peaks when a site fills its box. Two sites with five lines each cost more per line than one site with ten.
| Lines | Boxes | Monthly total | Per line | Copper at $95/line |
|---|---|---|---|---|
| 4 | 1 | $122 | $30.50 | $380 |
| 8 | 1 | $138 | $17.25 | $760 |
| 16 | 2 | $276 | $17.25 | $1,520 |
| 24 | 3 | $414 | $17.25 | $2,280 |
What is included
- Managed device with battery backup and replacement coverage
- Multi-carrier SIM with automatic failover
- Number porting for every retained line
- 24/7 line and device monitoring with alerting
- Line audit before cutover and documentation after it
What costs extra
- Fiber or dedicated broadband transport as primary path: $25 per month
- External antenna kits at weak-signal sites
- Electrical work if no outlet exists at the termination point
- Expedited porting where the losing carrier charges for it
Payback
For a single eight-line site replacing copper at $95 per line, the monthly saving is about $634 and the one-time install pays back in under two weeks of savings. Across a fifty-site estate the annual number is the reason these projects get approved.
Last updated 2026-08-20.