How to Stop Phone Spam, Robocalls, and Smishing Texts

If your phone rings with an unknown number promising to lower your interest rate, or a text claims a package is “held” pending a small fee, you are on the receiving end of the spam economy. Robocalls, spam texts, and “smishing” scams cost consumers billions every year. This guide explains how your number ends up on these lists, how the scams are engineered, and the concrete steps — official and practical — that measurably reduce the flood.

How spammers get your number

Your number leaks through more channels than you might think: data breaches that dump contact details online, data brokers that buy and resell it, web forms and loyalty programs that sell “marketing partners” access, and random dialling, where software simply tries every number in a range. Once your number is confirmed active — for instance, because you answered once — it becomes more valuable and gets sold onward.

Robocalls, spam texts, and smishing

Robocalls

Automated systems dial thousands of numbers and play a recording. Many spoof a local caller ID so the call looks familiar — “neighbour spoofing.” Legitimate robocalls exist (appointment reminders, genuine alerts), but unsolicited sales robocalls are generally illegal in the US without prior written consent.

Smishing (SMS phishing)

A text pretends to be your bank, a delivery company, or a government agency and pushes you to click a link or call a number. The goal is to harvest passwords, card numbers, or one-time codes. The tell is almost always urgency plus a link: “your account is locked, verify now.”

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Video: the US Federal Trade Commission on how to recognise and avoid robocall scams.

How to stop the flood: a practical checklist

No single trick eliminates spam, but stacking these measures cuts it dramatically:

1. Register with your national do-not-call list. In the US, add your number free at donotcall.gov. It stops legitimate telemarketers (scammers ignore it, but it reduces overall volume).
2. Turn on carrier call filtering. Most major carriers offer free spam-labelling and blocking — enable it in your account.
3. Use your phone’s built-in filter. iPhone’s “Silence Unknown Callers” and Android’s “Filter spam calls” send unknown numbers straight to voicemail.
4. Do not engage. Answering or pressing a key to “opt out” confirms your number is live and invites more calls.
5. Report spam texts. Forward them to 7726 (SPAM) in the US so carriers can act.
6. Use a disposable number for signups. Keep your real number off forms, contests, and unfamiliar services.

Why spam persists despite the rules

Caller-ID spoofing makes robocallers hard to trace, and many operate offshore beyond easy enforcement. Regulators are fighting back — the US now mandates the STIR/SHAKEN framework that cryptographically verifies caller ID between carriers — but the economics still favour spammers because calling is nearly free. That is why personal defences, especially keeping your number private, remain your most reliable protection.

Frequently asked questions

Does registering on the Do Not Call list stop all calls?

No. It stops legitimate telemarketers but not scammers, who ignore it. Combine it with carrier filtering and phone-based blocking for the biggest effect.

Should I press a key to opt out of a robocall?

No. Interacting confirms your number is active and typically leads to more calls. Simply hang up.

How do I report a spam text in the US?

Forward the message to 7726 (which spells SPAM) so your carrier can investigate, then delete it without clicking any links.