The *67 Myth: Why It Doesn’t Block Text Messages

Many people assume that dialing *67 before sending a text will hide their number the way it does on a voice call. That assumption is wrong — and it can lead to real compliance exposure for businesses that rely on text outreach.

The 67 prefix is a caller ID blocking feature built exclusively for the public switched telephone network. It operates at the voice signaling layer and has no technical pathway into the SMS protocol. Across every major regulatory guide — FCC consumer advisories, TCPA compliance resources, and carrier blocking frameworks — 67 is never mentioned as a valid method for blocking or anonymizing text messages. The FCC's own guidance on stopping unwanted robocalls and texts focuses entirely on consent revocation, keyword opt-outs, and network-level blocking tools, with no reference to *67 for SMS.

• Consumers can revoke consent through any reasonable method — including words like "stop," "quit," "end," "revoke," "opt out," "cancel," or "unsubscribe" — and businesses must honor those requests within 10 business days
• TCPA violations carry fines of $500 to $1,500 per message with no statutory damage cap, and lawsuits routinely reach millions in damages
• Noncompliance with 10DLC registration can trigger penalties up to $10,000 per non-compliant SMS message

For businesses running reactivation campaigns, this distinction matters. CallMyCustomers builds every outreach program on permission-based lists with explicit opt-out handling — because the regulatory framework demands functional, consumer-friendly opt-out mechanisms in every message, not technical workarounds that don't exist for text. The FCC requires that prerecorded telemarketing calls provide an opt-out option at the start of the message, and that same principle extends to texts: consumers may opt out at any time, in any reasonable manner, even if prior consent was given. Relying on *67 as a compliance strategy isn't just ineffective — it signals a misunderstanding of the rules that govern every text sent.

What Actually Works: FCC-Compliant Opt-Out Methods for Texts

Since *67 does nothing for texts, the good news is that the FCC has built a clear, legally enforceable system for making unwanted messages stop—one that actually works. Consumers can revoke consent at any time, in any reasonable manner, even if they previously agreed to receive messages, according to official FCC guidance.

The most recognized method is replying with keywords like "STOP." But the rules go much further than a single keyword. Under FCC rules effective April 11, 2025, consumers may revoke consent using any reasonable method that clearly expresses a desire not to receive further calls or texts, as Mintz Levin's legal analysis confirms. That means natural language like "please stop texting me" counts just as much as a formal opt-out.

The FCC has even identified specific words that qualify as per se reasonable revocation requests when sent as a reply text:

• "Stop," "quit," and "end"
• "Revoke," "opt out," and "cancel"
• "Unsubscribe"

For businesses, the obligations are strict and expensive to ignore. Once a revocation request arrives, it must be honored within 10 business days, and as Kelley Drye attorneys note, a single opt-out should be treated as revocation of consent for all marketing messages from that company—the FCC "does not endorse" treating texts and calls separately.

The financial stakes are significant. CompleteSMS's compliance guide reports that TCPA violations can result in fines of $500 to $1,500 per violation with no statutory damage cap, and lawsuits can reach millions of dollars. Noncompliant messages under 10DLC regulations can trigger fines of up to $10,000 per message.

This is why programs that only listen for the exact keyword "STOP" build vulnerability to complaints, as InsiderOne's compliance experts warn—brands must process any reasonable opt-out request promptly and without charge. At CallMyCustomers, every reactivation campaign is built around this principle: opt-outs are honored immediately, and outreach only goes to real customers who have given explicit consent. Permission-based messaging isn't just the safer legal path—it's the one that keeps past customers willing to hear from you again.

How CallMyCustomers Ensures Compliant Text Outreach for Service Businesses

The FCC and legal experts consistently confirm that *67 is a voice-only feature with no technical applicability to SMS, leaving businesses that rely on it for text compliance exposed to significant risk. Regulatory frameworks instead require functional opt-out mechanisms in every message and prompt honoring of revocation requests. TCPA violations can result in fines ranging from $500 to $1,500 per violation with no statutory damage cap, and noncompliance with 10DLC regulations can lead to fines of up to $10,000 per non-compliant SMS message.

CallMyCustomers builds compliance into every reactivation campaign by design. Each outreach uses pre-approved messages that include clear opt-out language, and the system honors revocation requests immediately — well within the FCC's 10-business-day maximum timeframe for processing opt-outs. Because the company works exclusively from lists of real customers who have an existing relationship with the business, consent is grounded in prior interaction rather than purchased data. Replies route directly into the client's booking process, so opt-outs are captured in real time and never missed.

• Pre-approved scripts and offers reviewed by the business owner before any message sends
• Clear opt-out instructions in every text, accepting natural language requests like "please stop texting me" as valid revocation
• Immediate suppression of opted-out contacts across all campaign channels — calls, texts, and email
• Outreach limited to existing customers, with booking flows that collect explicit consent for future contact

This permission-based approach aligns with guidance from legal experts who emphasize that a single opt-out must be treated as revocation for all marketing messages from a company. For service businesses in regulated verticals like dental and med spa, outreach operates under required privacy agreements with patient communications handled to clinical standards. The result is a reactivation engine that drives repeat revenue without exposing the business to the compliance gaps that technical shortcuts like *67 create.