Do spammers leave voicemails?

Yes, Spammers Leave Voicemails — and Ringless Voicemail Made It Worse

That voicemail sitting in your inbox from an unknown number? There's a good chance a spammer put it there — and they may not have even let your phone ring first. Yes, spammers leave voicemails, both as traditional robocall drops and through "ringless voicemail" technology that delivers messages straight to your inbox without your phone ever making a sound.

The scale is staggering. According to the YouMail Robocall Index, U.S. consumers received 52.5 billion robocalls in 2025 — roughly 1,627 calls every second in December alone. Worse, the mix is tilting toward junk: telemarketing and scam robocalls rose 15.4% year-over-year to 29.6 billion calls, now making up 57% of all robocalls, up from 49% in 2024.

Regulators have taken voicemail spam seriously enough to act on it directly. In a November 2022 Declaratory Ruling, the FCC held that ringless voicemail is a "call" under the TCPA — meaning it requires prior consumer consent. The ruling came after a petition seeking to exempt the technology drew more than 8,000 public comments, almost all in opposition.

FCC Chairwoman Jessica Rosenworcel didn't mince words about why. "Ringless voicemail can lead to the same kind of fraud that flourishes with scam robocalls," she stated, adding that the FCC was "making it crystal clear" that sending "this kind of junk" without permission violates its rules. The FCC also rejected the argument that the technology's clever routing — a landline-to-landline session to the carrier's voicemail server — exempts it, holding that "the effect on the recipient is identical" and an exemption "would elevate form over function."

That reasoning matters for legitimate businesses, too. The compliance line is consent, not technology, and the practical requirements for any voicemail outreach are clear:

• Obtain and document prior express consent before any prerecorded or AI-voice voicemail
• Scrub do-not-call lists before any outbound campaign
• Honor opt-outs immediately and permanently
• Respect quiet-hours restrictions on when messages can be delivered

Enforcement is escalating alongside the volume. The U.S. PIRG Education Fund reports the FCC shut down 1,388 non-compliant phone companies in August 2025 alone. For companies like GrowthPros, that environment makes consent-recorded leads — every one carrying disclosure text, a timestamp, and a named contacting party — less a nice-to-have and more the baseline for doing business without TCPA exposure.

The takeaway is simple: your voicemail inbox is an active spam channel, and the spammers using it are increasingly sophisticated. The next section covers what those messages actually sound like — and how to tell junk from legitimate outreach.

The FCC's 2022 Ruling: Voicemail Is a 'Call' Under the TCPA

The FCC’s November 2022 Declaratory Ruling settled a key question for businesses using automated messaging: ringless voicemail to wireless phones is legally a “call” under the TCPA and requires prior consumer consent. The ruling rejected a petition from All About the Message, LLC that sought to exempt the technology, drawing over 8,000 public comments — almost all in opposition — showing broad consensus among regulators and consumers that the loophole should not stand.

Central to the FCC’s reasoning was its “effect over function” principle: even though ringless voicemail avoids ringing the phone by routing directly to a carrier’s voicemail server, the impact on the recipient is functionally identical to a robocall. As the FCC stated, exempting the technology would “elevate form over function,” meaning technical workarounds offer no legal protection. This aligns with the Chairwoman’s warning that ringless voicemail enables the same fraud seen in scam robocalls, reinforcing that consent — not call completion method — determines TCPA applicability.

For businesses, this means any voicemail follow-up — whether traditional or AI-driven — must target only consent-recorded, opted-in leads. GrowthPros builds this requirement into its lead delivery process, ensuring every contact includes a verifiable consent trail with disclosure text, timestamp, and contacting party, so outreach remains compliant even as enforcement intensifies. The FCC’s stance leaves no room for ambiguity: if it goes to voicemail without permission, it’s regulated as a call.

Why Spam Voicemail Is Exploding: AI, Weak Enforcement, and Leaked Numbers

Spam voicemail isn't a fringe annoyance anymore — it's a scaling industry, and three forces are feeding it at once: cheap AI, slipping carrier compliance, and phone numbers that leak faster than you can say "do not call."

The first driver is artificial intelligence. U.S. PIRG warns that AI voice cloning lets scammers impersonate trusted individuals — a "close relative or lifelong friend" — in real time, making voicemail cons dramatically more believable. The same report notes the threats are "increasing with the explosion of artificial intelligence," and the economics back that up: the average scam call victim lost $3,690 in the first half of 2025, up 16% year over year.

The second driver is weak enforcement on the infrastructure side. STIR/SHAKEN — the caller-ID authentication framework meant to stop spoofed calls — is losing ground, not gaining it. According to PIRG's 2025 analysis, only 44% of phone companies (4,084 of 9,242) had fully implemented the framework as of September 2025, down from 47% in 2024. Meanwhile, telemarketing and scam robocalls climbed 15.4% in 2025 to 29.6 billion calls — now 57% of all robocalls, up from 49% the year before, per YouMail's Robocall Index.

The third driver is how spammers find you in the first place. Robokiller's research identifies the main leak paths:

• Public online exposure — your number sitting on directories, listings, and social profiles
• Data breaches that dump phone numbers onto scammers' databases
• Third-party sales, where your number changes hands as a data asset
• Lists of people who previously engaged with robocalls, making them repeat targets

Enforcement is fighting back, hard. The FCC shut down 1,388 non-compliant phone companies in August 2025 for failing robocall mitigation obligations, and it imposed a $10,000 penalty for false Robocall Mitigation Database submissions effective January 2025, per U.S. PIRG. The FCC has also closed the "ringless voicemail" loophole, ruling that voicemail delivered without ringing the phone is still a TCPA-regulated "call" requiring prior consent — because "the effect on the recipient is identical."

That regulatory line matters for legitimate businesses too. Voicemail and AI voice follow-up are legal tools — but only with documented consent, DNC scrubbing, and honored opt-outs. That's exactly why GrowthPros attaches a consent record to every lead it delivers, and why buyers should demand the same from any lead vendor.

How Legitimate Businesses Use Voicemail Without Becoming Spammers

Legitimate businesses can use voicemail follow-up without crossing into spam territory by grounding every interaction in documented consent. Unlike the 29.6 billion scam and telemarketing calls that flooded U.S. phones in 2025, compliant outreach treats voicemail as a regulated channel requiring prior express permission. The FCC’s 2022 Declaratory Ruling confirms that ringless voicemail to wireless phones constitutes a “call” under the TCPA, meaning the same consent rules apply whether the phone rings or the message lands silently in voicemail.

This compliance framework rests on four non-negotiable pillars: securing prior express consent before any contact, rigorously scrubbing lists against the National Do Not Call Registry, honoring opt-out requests immediately and permanently across all channels, and restricting outreach to legally permitted quiet hours. Industry guidance emphasizes that technology alone doesn’t determine legality — it’s how businesses handle consent, DNC lists, opt-outs, and timing that separates ethical follow-up from prohibited spam. For example, sending a voicemail to someone who never agreed to hear from your business, even via ringless technology, risks TCPA violations that can trigger fines of up to $1,500 per call.

GrowthPros embeds these principles into its lead delivery process by attaching a verifiable consent record to every lead — capturing disclosure text, timestamp, IP address, and the named contacting party. This documentation ensures that AI-powered voice, SMS, and email follow-up occurs only with contacts who have explicitly agreed to be reached, transforming voicemail from a spam vector into a trusted touchpoint. By anchoring outreach in proof of permission rather than assumptions, legitimate businesses avoid the reputational and legal pitfalls that plague the broader robocall ecosystem while still leveraging voicemail’s effectiveness for timely, personalized engagement.

• Document disclosure language, timing, and the identity of the caller for every lead
• Scrub all contact lists against the DNC registry before initiating any voice or SMS outreach
• Implement systems that permanently suppress opted-out numbers across voice, text, and email channels
• Restrict non-emergency voicemail delivery to FCC-defined quiet hours (typically 8 a.m. to 9 p.m. recipient time)

Your Action Plan: Audit Your Lead Vendor's Consent Trail

If your lead vendor can't prove where consent came from, that lead isn't an asset — it's a liability sitting in your CRM. With the FCC's Declaratory Ruling treating voicemail outreach, including ringless voicemail, as a fully regulated "call" under the TCPA, the paper trail matters more than the price per lead.

The enforcement climate raises the stakes. Regulators shut down 1,388 non-compliant phone companies in August 2025 alone, according to U.S. PIRG's robocall report, and telemarketing and scam calls now account for 57% of the 52.5 billion robocalls hitting U.S. phones, per the YouMail Robocall Index. Buying leads without a consent trail puts your business downstream of someone else's compliance failure.

Here's what to demand from any lead vendor before you spend another dollar:

• A complete consent record on every lead — the disclosure text the consumer saw, a timestamp, the IP address, and the named party they consented to be contacted by.
• Proof of DNC scrubbing before any outbound contact, plus documented opt-out handling that is honored immediately and permanently across voice, SMS, and email.
• Confirmation that any voicemail or AI voice follow-up targets only opted-in, consent-recorded contacts — never a cold or "recycled" list.

The FCC's reasoning is blunt: exempting ringless voicemail because of its technical routing would "elevate form over function," since the effect on the recipient is identical, as legal analysis of the ruling explains. Vendors promising technical workarounds are selling you exposure, not efficiency. Even platforms themselves acknowledge that compliance responsibility sits with the customer, not the tool.

This is why GrowthPros attaches a consent trail to every lead it delivers — disclosure text, timestamp, IP address, and the named contacting party — and scrubs lists against the DNC before any outbound touch. Voicemail and AI voice follow-up runs only against contacts who opted in, and opt-outs are honored across every channel. It's the same standard the FCC applies to anyone leaving a message, applied before a lead ever reaches your CRM.

The fastest way to vet any vendor, including us, is to ask for a sample lead file and inspect the consent fields yourself. A 15-minute qualification call walks you through exactly how leads are sourced, scrubbed, qualified, and delivered — with the documentation to back it up. If a vendor can't show you that in fifteen minutes, you have your answer.