How to find and cut unused company phone lines

How common are unused company phone lines?

Common enough that state auditors keep finding them. Three public audits show the pattern:

• California, December 2025. The state auditor found one agency paid more than $4.6 million in monthly fees for 6,285 mobile devices. Each went unused for four or more months in a row, between November 2020 and April 2025. [S1]
• Colorado, July 2026. About 400 of 6,688 state-issued cellphones had no calls, texts or data for a full year, at a cost of about $173,000, per Colorado Politics’ report on the state audit. [S2]
• New Jersey, July 2010. The state comptroller found more than 19,000 unused state phone lines. The state then cut 1,394 unused wireless lines. One former employee’s line had been paid for almost six years after she resigned. [S3]

These are public agencies. Companies can lose track the same way when no one checks usage line by line.

Why do unused lines stay on the bill for so long?

The usage data is usually already there. In California, the carrier’s own invoices showed which phones were not used. The auditor called the agency’s claim that it didn’t know “implausible.” [S1]

Common reasons lines survive:

1. No one reads the bill line by line. The total looks normal, so no one opens the detail.
2. People leave, lines stay. The phone comes back, or doesn’t, and the line keeps billing. See the offboarding checklist.
3. Records don’t match the bill. Colorado’s audit called its phone tracking records “unreliable or incomplete.” [S2]
4. Big rollouts outlive the need. California’s devices were bought when call center staff went remote during COVID-19. The lines kept billing after the pandemic ended. [S1]
5. Canceling feels harder than paying. A device balance, an unclear owner or a contract question makes it easier to leave the line alone.

How do you find unused company phone lines?

Pull usage for every line, then match each to a person. Step by step:

1. List every carrier account. Include accounts from past acquisitions and other offices.
2. Pull a line list from each account. Every phone number, tablet and hotspot.
3. Pull usage for each line. Calls, texts and data, for at least the last three months.
4. Flag lines with zero use. Then flag lines with almost none, like a handful of texts.
5. Match each line to a person and a cost center. Use your HR list and device records.
6. Flag lines with no owner. Also flag names like “Spare,” “Loaner” or a person who has left.

At the end you have a short list of lines to review.

How do you cut them without breaking anything?

Check each flagged line before you cancel it.

How often should you check for unused lines?

Check monthly if you can. Quarterly at least.

Set a simple rule, like the one a California agency (the Employment Development Department) adopted in 2025: review any device unused for 90 days in a row. [S1] Tie phone checks to offboarding too, since leavers are a common source of dead lines.