Where to find the block feature on your phone

Most phones let you block a number directly from the message thread. Open the text message from the sender you want to block, then look for a menu icon (three dots or lines) at the top or bottom of the screen. Tap it and select "Block" or "Block number"—the exact wording depends on your phone's operating system.

On iPhone, you can also go to Settings > Messages > Blocked Contacts and add a number manually. On Android, the path varies by manufacturer, but Settings > Apps > Messages > Blocked numbers is common. Some Android phones let you block directly from the Contacts app by opening the contact and tapping the block option.

If you do not recognize the number at all, you do not need to open the message first. Many phones let you block unknown senders in bulk through Settings, which stops texts from numbers not in your contacts.

Key Takeaways

  • You can block a number from the message thread itself by tapping the menu icon and selecting Block, which works on both iPhone and Android.
  • iPhone users can also add numbers to a blocked list in Settings > Messages > Blocked Contacts without opening a message first.
  • Android phones have a Blocked numbers section in the Messages app settings where you can enter numbers manually.
  • Blocking a number stops text messages and calls from that sender, but they may not know they are blocked.
  • Some phones let you block all unknown senders at once, which is useful if you are receiving many unwanted texts from numbers not in your contacts.

What happens when you block a number

When you block a number, text messages from that sender stop appearing in your message threads. The messages are not delivered to your phone at all—they do not sit in a separate folder you have to manage. On most phones, the blocked sender cannot reach you by text or call.

The person you blocked will not receive a notification that they are blocked. Their message may appear to send normally on their end, but it will not arrive on your device. This is different from blocking on social media apps, where the other person often knows they have been blocked.

Blocking spam and scam texts specifically

Spam and scam texts often come from numbers that change with each message, so blocking individual numbers is less effective than it sounds. Instead, use your phone's spam filter. On iPhone, go to Settings > Messages and turn on "Filter Unknown Senders"—this moves texts from numbers not in your contacts into a separate tab. On Android, open the Messages app, tap the menu, go to Settings > Spam and abuse, and turn on spam protection.

Many carriers also offer spam-blocking tools. Verizon has Call Filter, AT&T has Call Protect, and T-Mobile has Scam Shield. These services flag suspected spam before it reaches your phone and let you block entire categories of calls and texts. Some versions are free; others charge a monthly fee. Check your carrier's website to see what is available on your account.

If a text claims to be from your bank, payment app, or social media account, do not click any links or reply with information. These are almost always scams. Block the number and report it to the company the message claims to be from.

Using third-party apps for blocking

If your phone's built-in blocking does not meet your needs, apps like TrueCaller, RoboKiller, and Nomorobo add extra layers of filtering. These apps can block numbers based on patterns (like all numbers from a certain area code) and let you create custom block lists. Some also show you whether an incoming number is flagged as spam before you even see the message.

Third-party apps work best when combined with your phone's native spam filter rather than as a replacement. Install one, set it to block the categories that bother you most, and let your phone's built-in tools handle the rest. Be aware that some of these apps request access to your contacts or message history—read the permissions carefully before installing.

Blocking texts from specific apps and services

Some unwanted texts come from apps or services you signed up for but no longer want to hear from. These are usually legitimate messages, not scams, but they clutter your inbox. Look for an "Unsubscribe" link at the bottom of the message and tap it, or reply with "STOP" to opt out. Most services are required by law to honor this request within a few days.

If unsubscribing does not work, you can block the number. However, the service may use different numbers for different messages, so you might need to block multiple numbers over time. Unsubscribing is faster and more permanent than blocking.

Recovering from a blocked number mistake

If you blocked a number by accident, you can unblock it. On iPhone, go to Settings > Messages > Blocked Contacts, find the number, and swipe left to unblock it. On Android, open the Messages app, tap the menu, go to Blocked numbers, find the entry, and tap the minus sign or delete option.

Once you unblock a number, messages from that sender will start coming through again. However, any messages that arrived while the number was blocked will not reappear—they are gone. If you need to recover an important message, ask the sender to resend it.

When blocking is not enough

If you are receiving threats, harassment, or repeated contact after blocking, save the messages and report them to your carrier and local police. Blocking stops the messages from reaching you, but it does not create a record that law enforcement can use. Screenshot the messages with the sender's number visible before deleting anything.

If the harassment is tied to a data breach or account compromise—for example, someone is texting you claiming to be from your bank—change your passwords and check your accounts for unauthorized activity. Blocking the number stops the when ready problem, but addressing the underlying breach prevents future contact.

Frequently Asked Questions

Can someone tell if I blocked them?

No. When you block a number, the sender does not receive a notification. Their messages may appear to send normally on their end, but they will not reach your phone. They might suspect they are blocked if you stop responding, but the phone system does not tell them.

What is the difference between blocking and muting a conversation?

Muting silences notifications from a conversation but the messages still arrive on your phone. Blocking stops the messages from reaching you entirely. Use muting for conversations you want to keep but do not want to be interrupted by, and blocking for senders you do not want to hear from at all.

If I block a number, will old messages from that sender disappear?

No. Blocking only stops new messages from arriving. Messages you received before blocking the number stay in your message thread. You can delete them manually if you want them gone.

Can I block a text from someone in my contacts?

Yes. You can block anyone, whether they are in your contacts or not. Open their contact card or a message from them, tap the menu, and select Block. They will stay in your contacts, but you will not receive messages or calls from them.

Do I need to pay for spam-blocking services?

Your phone's built-in spam filter is free and handles most unwanted texts. Carrier services like Verizon Call Filter and AT&T Call Protect offer free versions with basic filtering, and paid versions with more features. Third-party apps vary—some are free, others charge monthly. Start with your phone's native tools before paying for extra protection.