Stop Replying 'STOP': Why Responding to Spam Texts Is Dangerous and How to Block Them for Good

Your phone buzzes. It's a text from an unknown number, maybe a political candidate, a car warranty salesperson, or a "wrong number" asking about dinner plans. You might be tempted to reply "STOP" or politely tell the sender they have the wrong person. Don't!

Security experts are warning that responding to spam texts, even just to say "stop", can make you a bigger target. According to PCMag, replying to a spam text confirms that your phone number belongs to a real person who reads and responds to messages. That confirmation turns you from a random number in a database into a verified, responsive target.

Why 'STOP' Doesn't Work on Scammers

Many legitimate businesses include a "text STOP to opt out" option in their messages. For those companies, it works. But for scammers, it does nothing. As PCMag explains, "this option is ineffective against scammers". Worse, it tells the scammer that your number is active and that you're willing to engage.

These texts are referred to by Malwarebytes security experts as a "personality test." Attackers discover several facts about you when you respond:

• You're responsive because you saw the message and felt obliged to respond.

• You're courteous; scammers take advantage of your desire to assist a stranger.

• You respond fast, which shows how carefully you keep an eye on your phone and how likely you are to reply to messages in the future.

• After that, your number is shared, tagged, and sold to other fraudsters.

The Real Danger: Links and Attachments

While responding to a text message by itself won't compromise your device, clicking links or opening attachments poses a greater risk. According to the FTC, scams that began with a simple text message cost people $470 million in 2024—a five-fold increase from 2020. In Q3 2025, "smishing," or SMS-based phishing, impacted 13% of all devices globally.

How to Block Spam Texts for Good

Prevention is the best line of defense. Although your phone contains built-in filters, they are frequently disabled by default.

Using an iPhone:

Navigate to the Message Filtering area by scrolling down from Settings > Apps > Messages. Turn on the filter for unknown senders. This allows you to safely ignore texts from unknown numbers by sorting them into a different folder.

On Android:

Launch Google Messages, choose your profile, navigate to Message settings > Spam prevention, and turn it on. This blocks texts that are thought to be spam using machine learning.

Beyond integrated filters:

• Never say "STOP" or "wrong number" in response to dubious SMS.

• Forward the message to 7726 (SPAM on your keypad) to report spam.

• Use your messaging app to immediately block the number.

• Many providers offer network-level protection, so check the spam-blocking capabilities offered by your carrier.

How Bayon Technologies Group Can Help You Stay Safe

At Bayon Technologies Group, we understand that spam texts are more than an annoyance; they're a security risk. We help organizations and individuals build resilience against social engineering and mobile threats through security awareness training, mobile device security assessments, and incident response planning. Contact us today to learn how we can help you protect your digital life.