Blocking spam texts on your phone

Most phones have a built-in block feature that stops texts from specific numbers or senders from reaching your inbox. On iPhone, you open the message thread, tap the sender's name at the top, scroll down, and choose "Block this Caller." On Android, you long-press the message, tap the three dots, and select "Block." Once blocked, texts from that number stop appearing in your messages, and the sender gets no notification that you blocked them.

The block works only for that one number. If a spammer uses a different number the next time, you'll need to block that one too. This is why blocking alone isn't a complete solution — spammers often rotate through numbers to get around blocks. But blocking is still worth doing for repeat offenders, because it stops the ones you've already identified.

Key Takeaways

  • Your phone's built-in block feature stops texts from a specific number, but spammers often use new numbers each time.
  • iPhone blocks are found in the message thread under the sender's name; Android blocks are accessed by long-pressing the message.
  • Reporting spam to your carrier (AT&T, Verizon, T-Mobile, or others) helps them identify patterns and can block numbers before they reach you.
  • Filtering apps like TrueCaller or your carrier's spam filter can catch unknown spam before it lands in your main inbox.
  • Never reply to spam texts or click links in them, even to unsubscribe — this confirms your number is active and leads to more spam.

Report spam to your carrier

Your phone carrier — AT&T, Verizon, T-Mobile, or whoever you pay for service — has a spam reporting system. When you report a number, they add it to a database that helps them block similar patterns for other customers. This is more effective than blocking on your own, because the carrier can stop the message before it reaches anyone's phone.

To report spam, forward the message to your carrier's spam line. AT&T uses 7726 (SPAM), Verizon uses 7726, and T-Mobile uses 7726. You text the spam message to that number, and the carrier logs it. You can also call your carrier's customer service line and report the number verbally, though texting is faster. The carrier won't contact you back — they just add the report to their system.

Reporting takes a minute and costs nothing. If you get repeated spam from the same number, report each one. The more reports a number gets, the faster the carrier flags it as spam for everyone.

Use your phone's spam filter

Both iPhone and Android have built-in spam filters that catch many spam texts before they reach your inbox. On iPhone, go to Settings, tap Messages, and turn on "Filter Unknown Senders." This moves texts from numbers not in your contacts to a separate tab. You won't see them unless you look, but they're still there if you need them.

On Android, the process depends on your phone model and carrier. Most Android phones have a Messages app with a spam filter built in. Open Messages, tap the three dots in the top right, go to Settings, and look for "Spam protection" or "Block numbers." Turn it on. If your phone doesn't have this option, your carrier may offer it through their own app — check your carrier's website for instructions.

These filters aren't perfect. Some spam gets through, and occasionally a real message gets marked as spam by mistake. Check your spam folder once a week to make sure nothing important landed there.

Third-party spam filtering apps

Apps like TrueCaller, RoboKiller, and Nomorobo add an extra layer of filtering on top of your phone's built-in tools. They maintain databases of known spam numbers and block them before the text reaches you. Some also use artificial intelligence to recognize patterns in spam messages and block similar ones.

These apps work best when many people use them, because the more users report spam, the better the database becomes. TrueCaller is free and works on both iPhone and Android. RoboKiller costs money but offers more aggressive filtering. Nomorobo is free for landlines and has a paid version for cell phones.

The downside is that third-party apps need permission to read your messages and contacts, which raises privacy concerns for some people. Read the app's privacy policy before installing. Also, these apps sometimes block legitimate messages, so check your spam folder regularly.

What not to do with spam texts

Never reply to a spam text, even to say "stop" or "unsubscribe." Replying confirms that your number is active and monitored by a real person. Spammers sell lists of active numbers to other spammers, and you'll end up on more lists. The same goes for clicking links in spam texts — this tells the sender your number works and that you're willing to engage.

Don't call a number back if the text claims to be from your bank, the IRS, or a delivery service. Legitimate organizations contact you through official channels, not random texts. If you think the message might be real, hang up and call the organization directly using a number from their official website or your statement.

If a spam text asks for personal information — your Social Security number, bank details, passwords — it's a scam. Your bank, the government, and real companies never ask for this information by text. Delete the message and report it to your carrier.

When spam texts are part of a scam

Some spam texts are part of larger scams. A text might claim you've won a prize, that your package is delayed, that your account has been locked, or that you owe money. These are designed to make you click a link or call a number, which either installs malware on your phone or connects you to a scammer who tries to steal money or information.

If a text creates urgency — "act now," "confirm immediately," "your account will close" — it's almost certainly a scam. Real organizations give you time to respond. Delete the message, block the number, and report it to your carrier. If you already clicked a link, run a security scan on your phone using your phone's built-in security app or a third-party antivirus app like Malwarebytes.

If you gave out personal information, contact the organization the scammer impersonated and let them know. If it was your bank, credit card company, or a financial institution, also place a fraud alert with the credit bureaus (Equifax, Experian, or TransUnion) to watch for unauthorized accounts opened in your name.

Frequently Asked Questions

Can I block all unknown numbers at once?

Not all at once, but you can set your phone to filter them. iPhone's "Filter Unknown Senders" moves texts from numbers not in your contacts to a separate tab. Android's spam filter does something similar. You still have to block individual numbers manually, but filtering keeps them out of your main inbox.

Does blocking someone stop them from seeing my messages?

No. Blocking stops their messages from reaching you, but if you send them a text before you block them, they'll receive it. Once you block them, your future texts won't go through — they'll either fail to send or sit in limbo, depending on your phone.

What if spam texts keep coming from different numbers?

This is common with scammers and robocalls. Keep blocking and reporting each number. Also turn on your phone's spam filter if you haven't already. If the spam is overwhelming, contact your carrier — they can sometimes add a filter to your account that blocks entire ranges of numbers or certain types of messages.

Can I report spam texts to the police?

If the spam is part of a scam that cost you money or personal information, yes — report it to your local police department's non-emergency line and to the Federal Trade Commission at reportfraud.ftc.gov. For regular spam, reporting to your carrier is more effective than police, because carriers can block the numbers immediately.

Will blocking a number stop them from calling me?

Yes. Blocking a number blocks both texts and calls from that number. The person won't know they're blocked — the call or text just won't go through on your end.