You can block texts on any phone, and the method depends on whether you want to stop one sender or filter a whole category

Every phone — iPhone, Android, or older models — has a built-in way to block individual numbers. Most also let you filter out spam automatically. The fastest route is to open the message, tap the sender's number, and choose "Block" from the menu. For ongoing spam (robocalls pretending to be your bank, texts offering loans), your carrier and your phone's operating system both have filters you can turn on without blocking anyone manually.

What you choose depends on what's bothering you. A single harassing contact needs a block. Hundreds of spam texts need a filter. This guide covers both, plus what happens after you block someone and what to do if blocking isn't enough.

Key Takeaways

  • On iPhone, open the message, tap the sender, and select "Block this Caller" — on Android, long-press the message and tap "Block" or the block icon.
  • Your phone carrier (Verizon, AT&T, T-Mobile, etc.) offers spam filters you can turn on for free in your account settings or through their app.
  • iPhone's built-in filter and Android's spam detection catch many unwanted texts automatically once you turn them on.
  • Blocking someone stops their texts from reaching your phone, but they may not know they're blocked — some phones show a delivery failure, others don't.
  • If blocking and filtering don't stop the texts, the sender may be spoofing a number or using multiple accounts, which requires reporting to your carrier or the FTC.

Blocking a single sender on iPhone

Open the message thread from the person you want to block. Tap their name or number at the top of the conversation. On the contact card that appears, scroll down and tap "Block this Caller." Confirm when the phone asks you to verify.

After you block someone, their texts won't show up in your Messages app, and calls from that number won't ring through — they'll go straight to voicemail. Any messages already in your inbox stay there, but new ones from that number won't arrive. If you change your mind, go to Settings > Messages > Blocked Contacts (or Settings > Phone > Blocked Contacts for calls) and tap "Edit," then tap the minus sign next to the number to unblock.

Blocking a single sender on Android

Open the message thread from the person you want to block. Long-press the message until a menu appears. Tap the block icon (usually a circle with a slash) or look for "Block" in the menu options. Some Android phones ask you to confirm; others block immediately.

Once blocked, texts from that number go to a separate folder (usually called "Blocked" or "Spam") instead of your main inbox. You can still see them if you look, but they won't notify you. To unblock, go to Settings > Messages > Blocked Numbers (the exact path varies by phone maker) and tap the number you want to unblock.

Turning on your carrier's spam filter

Your phone company — Verizon, AT&T, T-Mobile, US Cellular, or another carrier — runs a spam-filtering service that catches many unwanted texts before they reach you. These filters are usually free and turned off by default, which means you have to switch them on yourself.

Verizon offers Call Filter (free version blocks known spam; paid version adds more features). Log into your Verizon account online or open the My Verizon app, go to Account > Notifications & Alerts > Call Filter, and toggle it on. AT&T offers Call Protect (free version available). Open the AT&T Mobile Security app or log into your AT&T account and enable it. T-Mobile includes Scam Shield for free — go to your T-Mobile account online or use the T-Mobile app and turn on "Block Fraud Alerts" and "Block Spam." US Cellular offers Call Guard; check your account settings or contact customer service to enable it.

These filters learn over time and improve as they see what spam looks like on your account. They're not perfect — some spam still gets through, and occasionally a real message gets caught — but they stop the majority of unwanted texts without you having to do anything.

Using your phone's built-in spam detection

Both iPhone and Android have their own spam filters separate from your carrier's. On iPhone, go to Settings > Messages and toggle on "Filter Unknown Senders." This moves texts from people not in your contacts to a separate tab, so they don't interrupt you but you can still read them if you want. It doesn't block the messages — it just hides them.

On Android, the steps vary by phone maker, but most include a spam filter in the Messages app itself. Open Messages, tap the three-line menu (or settings icon), look for "Spam protection" or "Block numbers," and turn it on. Google Pixel phones have this built in; Samsung phones have it in the Messages app settings. If you're not sure where it is on your phone, search your Settings for "spam" and you'll find it.

These filters work alongside your carrier's filter, not instead of it. Using both gives you the best coverage.

What happens when you block someone

When you block a number, the sender's texts don't reach your phone at all. On their end, they may see a delivery failure message, or they may see nothing — it depends on their phone and carrier. They won't get a notification saying "you've been blocked," but they'll figure it out if they keep texting and never get a response.

Blocking is different from muting. If you mute a conversation, you still get the texts, but your phone doesn't alert you. If you block, the texts don't arrive at all. Blocking is also different from reporting spam — when you report a number as spam, you're telling your carrier or the phone company that the number is sending unwanted messages, which helps them improve their filters for everyone.

When blocking isn't enough

Some spam texts come from numbers that change every time, or from a spoofed number (a fake number that looks real). If you block one number and immediately get a text from a similar one, the sender is likely spoofing. Blocking each number individually won't solve this.

If this is happening to you, make sure your carrier's spam filter and your phone's spam detection are both on — they're better at catching spoofed numbers than you are at blocking them one by one. If the texts are harassing or threatening, take a screenshot and report them to the FTC at reportfraud.ftc.gov. If they're from someone you know and they won't stop, you may need to contact local police, especially if the messages include threats or unwanted contact after you've asked them to stop.

Never reply to spam texts, even to say "stop" — replying tells the sender your number is active and monitored, which makes you a better target for future spam.

Frequently Asked Questions

Can someone tell if I blocked them?

Not directly. They won't get a notification that says "you've been blocked." But if they text you and never get a response, and their calls go straight to voicemail, they'll figure it out. Some phones show a delivery failure message, which tips them off faster.

If I block someone, can they still call me?

No. Blocking a number blocks both texts and calls from that number. Calls go to voicemail, and they won't see a "call failed" message — it will just ring on their end and then go to your voicemail, the same as if you didn't answer.

What's the difference between blocking and reporting spam?

Blocking stops one number from reaching you. Reporting spam tells your carrier or phone company that the number is sending unwanted messages, which helps them filter it for other people too. You can do both — block the number to stop it immediately, and report it to help prevent it from reaching others.

Will turning on spam filters block real messages?

Occasionally, yes. Filters sometimes catch legitimate messages by mistake, especially from banks or services you don't text with often. Check your spam or blocked folder regularly, and if you find real messages there, you can unblock the sender or adjust your filter settings. Most carriers let you whitelist numbers (mark them as safe) so they never get filtered.

What should I do if the same person keeps texting from different numbers?

This is harassment, not spam. Block each new number as it appears, but also take screenshots and report the pattern to local police if the messages are threatening or unwanted contact after you've asked them to stop. Your carrier may also be able to help if you explain that one person is using multiple numbers.