There’s a reason the phrase “the devil is in the details” was practically invented for telecom billing. Invoices arrive. They get processed. They get paid. And somewhere between the carrier’s billing system and your accounts payable queue, money quietly bleeds out, line item by line item, month after month, with nobody in the wiser.
It’s not a dramatic failure. It rarely announces itself. But the numbers are hard to argue with. According to Gartner, up to 85% of telecom invoices contain errors, and those errors quietly add up to 12–20% in monthly overspending. For a mid-sized company running a $500,000 annual telecom budget, that’s anywhere from $60,000 to $100,000 walking out the door every year without a word.
The culprit is rarely negligence. Lack of a real telecom expense management strategy. A telecom strategy that keeps billing, contracts, inventory, and usage in check all at once. Most organizations fall into the same traps, and most of those traps are entirely avoidable. Here are the seven that show up most frequently.
Mistake #1: Paying Bills Without Actually Reading Them
Let’s call this one what it is: the original leak of telecom finance. Invoices come in, the totals look roughly familiar, and they get approved. Nobody is reading 47 pages of line items for a WAN circuit invoice. Nobody has time. So, bills are paid and errors get funded.
But that’s exactly what carriers count on.
On top of that, billing errors look like a duplicate charge buried three pages in. A rate that doesn’t match what was negotiated in the contract. A surcharge applied to a service that was cancelled six months ago. Individually, these may look small. Cumulatively, they compound into thousands of dollars in recoverable overcharges – money that’s already been handed over and may take a formal telecom dispute process to get back.
The fix: Every invoice needs to be validated against your contract terms and your active inventory before payment clears. If your team doesn’t have the bandwidth for that kind of line-by-line scrutiny (which most don’t), that’s precisely what a TEM solution is built for.
Mistake #2: Keeping a Sloppy (or Nonexistent) Inventory
Ask your IT lead how many active circuits your organization is currently running. Then ask finance. Then pull the carrier’s records. If all three answers match, you’re in rare company.
The absence of a centralized, current inventory is one of the most expensive structural gaps in telecom expense management. Because every other function depends on it. You can’t audit an invoice accurately if you don’t know what you actually own. You can’t identify unused services if you have no reliable baseline of what’s supposed to be in use. You can’t negotiate a telecom contract with any real leverage if your data is three steps behind reality.
Valicom worked with one long-standing client. A hospitality company managing thousands of WAN circuits across hotel properties. The company was receiving paper invoices in boxes each month with no accurate inventory to cross-reference against. That’s an extreme case, but the underlying problem scales directly to mid-sized companies managing 20 locations just as easily as to enterprises managing 200.
Needless to say, an accurate, living inventory builds the foundation every other piece sits on.
Mistake #3: Letting Contracts Auto-Renew Without Renegotiating
A telecom contract is one of the most consequential documents your organization ever signs. It locks in price, terms, and flexibility for years at a stretch. Which is why it’s staggering how often companies let them quietly roll over without a second glance.
Auto-renewal is the carrier’s preferred outcome. It means they keep you at existing rates (often above-market by renewal time), you forfeit the window to introduce competition, and the leverage that comes with a real RFP process simply evaporates.
The principle here mirrors what economists call “status quo bias.” The documented human tendency to accept the current state of affairs simply because changing it requires effort. In telecom finance, that bias has a price tag. The telecom contract management process needs to start at least six months before any renewal date. It gives you enough runway to benchmark current rates, issue an RFP if warranted, and negotiate from a position of genuine strength rather than deadline pressure.
Miss the window once, and you could be locked into yesterday’s pricing for another two or three years.
Mistake #4: Not Disconnecting What You’re No Longer Using
“Zombie services” is the industry’s name for them: circuits, lines, and devices that keep generating monthly charges long after the employee left, the office closed, or the equipment was retired. They don’t cancel themselves. And if your team didn’t formally submit a disconnect order with the carrier, the billing continues indefinitely.
Statistically, zombie services can consume up to 15% of a company’s mobile budget, according to industry analysis from Expensify’s TEM research. That figure tends to be higher for organizations that have gone through growth spurts, acquisitions, or office consolidations without a disciplined cleanup process on the back end.
The warning signs are subtle, not quite obvious. A line no one recognizes, a circuit for an address you vacated, a tablet plan for a device that’s been sitting in a drawer since 2022. Finding these requires an inventory audit. Removing them requires formal disconnect orders. Recovering what was already paid requires going back through billing history and raising telecom disputes where appropriate.
Admittedly, it’s not glamorous work. However, the savings are immediate, permanent, and fully recoverable.
Mistake #5: Treating Disputes as One-Off Events
When a billing error surfaces, the typical response is to raise a dispute, collect the credit (if the carrier cooperates), and move on. That approach solves last month’s problem. It doesn’t prevent next month’s.
Carriers are not particularly organized about issuing credits proactively. Dispute tickets get lost. Credits get applied in the wrong billing period. Some carriers require documentation in formats their own billing teams take weeks to process. Perhaps without a structured tracking system, your finance team often ends up absorbing errors rather than fighting them, because the fight takes more time than the credit seems worth.
A proper telecom disputes workflow means documenting discrepancies at the invoice level, logging them against specific contract terms, tracking each case through to resolution, and –critically – using the pattern of errors to sharpen future contract language. The goal isn’t just to recover the credit. It’s making the same error expensive enough for the carrier to stop it from happening.
Mistake #6: Underestimating Mobile as a Cost Category
Wireless spend has grown into one of the largest and most volatile line items in the telecom budget for most mid-sized companies. And yet, it tends to receive the least scrutiny. Plans get added faster than old ones get removed. International trips generate roaming charges that nobody approved. Devices rotate through employees without formal lifecycle tracking.
The outcome is a mobile program that, left unmanaged, consistently costs 20-30% more than it should. Right-sizing mobile plans requires actual usage data, which devices are consuming data, which are barely active, whether pooled data makes more financial sense than individual allocations, and whether current plans were designed around real consumption or a carrier sales rep’s best estimate.
For organizations that haven’t looked hard at their wireless spend recently, a telecom audit focused on mobile is frequently one of the fastest sources of both immediate savings and ongoing cost reduction.
Mistake #7: Assuming Someone Else Is Watching
This is perhaps the most human mistake on the list. In many organizations, telecom cost oversight occupies a grey zone between IT and finance. IT assumes finance is validating rates, finance assumes IT is managing inventory, the CFO assumes both are on top of it. In reality, nobody is.
Peter Drucker’s observation has never been more apt: what gets measured gets managed. Telecom spend, in most organizations, doesn’t get measured consistently. Not because people don’t care, but because the combination of specialized knowledge, time, and tooling required to do it properly outstrips what most internal teams can realistically sustain alongside everything else they’re responsible for.
That’s the structural case for outsourced telecom expense management. Organizations working with a dedicated TEM partner (one with both purpose-built software and experienced analysts) routinely identify savings of 10–30% on annual telecom spend, not through dramatic overhauls, but by doing consistently what most companies only attempt once.
The overspending isn’t happening because anyone is careless. It’s happening because telecom is complex, billing is error-prone, and without a structured process watching every moving part, the leaks are inevitable.
Where to Go from Here
Most of these mistakes don’t require a complete overhaul to address. They require a starting point – typically a telecom audit that establishes an accurate picture of what you own, what you’re paying, and where the gaps between those two things live.
If you’re unsure which of the seven apply to your organization, the 5 warning signs you need a telecom audit is a practical place to start. The patterns tend to be recognizable once you know what you’re looking for.
And if the patterns look familiar, the budget conversations that never quite resolve, the invoices that don’t quite match, the contracts that renewed without anyone really noticing, that’s not a coincidence. That’s what unmanaged telecom looks like. The good news is that it’s entirely fixable.
Valicom helps mid-sized and enterprise organizations get full visibility and control over their telecom spend through a purpose-built TEM software Clearview and dedicated analyst support.