The hidden cost of zombie services: what's still running at locations you closed

Zombie telecom services are circuits, lines, devices, or subscriptions that an organization continues paying for even though they no longer serve an active business need. They commonly appear after office closures, consolidations, completed projects, employee departures, and contract renewals—and they create telecom expense waste that invoice review alone may not reveal.

What zombie services are, and why they survive

These unused telecom services are not usually the result of fraud. They are the result of operational gaps—especially the gap between the team that manages locations and the team that manages telecom.

When a location closes, someone notifies facilities. Someone notifies HR. Someone updates the org chart. But the person responsible for canceling the T1 circuit, the alarm line, the mobility devices, and the SaaS subscriptions tied to that address? Often, nobody. No one has a clear line of ownership across all of those systems simultaneously.

The result is services that keep running, invoices that keep arriving, and costs that keep accumulating, sometimes for years.

The financial impact is easy to underestimate

Even a small number of recurring charges can create meaningful telecom expense waste when they continue month after month. Some comes from closed-location telecom charges. Some is service creep: lines added for a project that ended, devices assigned to employees who left, or contracts that renewed for capacity no longer needed.

The exact opportunity varies by organization, which is why a service-level reconciliation is more useful than relying on a broad industry percentage. The goal is to establish what is active, who owns it, whether it is still required, and what can be changed without operational risk.

These costs have usually been audited. They appear in reports, pass through accounts payable, and are reviewed by finance. The problem is that looking at invoices is not the same as knowing whether the underlying services are still needed.

How zombie services hide in plain sight

Inventory is incomplete. Most organizations do not have a current, accurate record of what they are running at each location. Billing data shows what is being paid; location records show which sites are active. Reconciliation is rarely done comprehensively.

Carrier billing does not reflect operational reality. When a location closes, the carrier continues billing until someone submits and completes a disconnect request.

No one owns the reconciliation. Finance owns the budget, IT owns the infrastructure, Operations owns the locations, and TEM owns the invoices. The question “is this service still needed?” sits between those teams.

A systematic approach to finding them

The starting point is a telecom inventory audit that goes beyond billing data. What services are provisioned at each address, is that address operationally active, who owns each service, and is the service still required?

This reconciliation has to happen at the service level, not the account level. Account-level reporting can show correct billing while hiding individual circuits running to closed facilities.

Once inventory is reconciled, disconnect candidates become structured: services at closed locations, services at active locations that are no longer justified, and gray-area items requiring owner validation.

The disconnect process matters as much as identification

Finding zombie services is only half the work. Disconnecting them without creating service disruption or contract penalties is the other half.

Carrier processes vary. Some require advance written notice, some have minimum terms, and some require technical steps before billing stops. The work must be managed through completion and billing confirmation.

Preventing new zombies

The longer-term fix is building technology offboarding into the location lifecycle. Every closure, restructuring, and acquisition integration should trigger a formal technology review.

This requires a checklist, a responsible owner, and a connection between location management and technology governance. Organizations that do this well prevent zombie services instead of finding them years later.