Block a text sender on iPhone or Android

The fastest way to stop someone from texting you is to block them directly in your phone's messaging app. On both iPhone and Android, blocking prevents that person from sending you text messages, and you won't see their messages arrive. The blocked person won't receive a notification that they're blocked, but they may figure it out if their messages don't get responses.

On an iPhone, open the Messages app, find the conversation with the person you want to block, swipe left on their name, and tap the trash icon, then "Delete." This removes the conversation but doesn't block them. To actually block them, tap "Edit" in the top left, select their conversation, tap "Delete," then go to Settings > Messages > Blocked Contacts and add their number manually. Alternatively, open their conversation, tap their name at the top, scroll down, and tap "Block this Caller."

On Android, the process depends on which messaging app you use. In Google Messages (the default on most Android phones), open the conversation, tap the three dots in the top right, and select "Block." In Samsung Messages, long-press the conversation and tap the block icon. Other messaging apps like WhatsApp or Signal have their own block features within the app itself.

Key Takeaways

  • iPhone users can block a texter through Settings > Messages > Blocked Contacts or by opening the conversation and tapping the sender's name, then "Block this Caller."
  • Android users should open their default messaging app (usually Google Messages), find the conversation, tap the menu, and select "Block."
  • A blocked person cannot send you text messages, but they won't receive a notification that they're blocked.
  • Blocking only affects text messages and calls from that number; if they contact you from a different number, you'll still receive those messages.
  • You can unblock someone at any time by going back to your blocked contacts list and removing them.

What happens when you block someone's number

When you block a number on your phone, that person's text messages won't arrive in your inbox. On iPhone, their messages are silently rejected. On Android, the behavior varies slightly by app, but the result is the same: you don't see the message. The blocked person typically won't know they're blocked unless they try to call you and hear a different ringtone or voicemail behavior, or they notice you never respond.

Blocking is different from deleting a conversation. Deleting just removes the chat history from your screen, but the person can still text you. Blocking prevents new messages from arriving at all. If you want to keep the conversation history for reference but stop receiving new messages, you need to block, not delete.

Block calls and texts from unknown numbers

If you're receiving unwanted messages from numbers you don't recognize, most phones let you block unknown callers or filter spam texts automatically. On iPhone, go to Settings > Phone > Silence Unknown Callers to send calls from numbers not in your contacts to voicemail. This doesn't block texts, but it stops the calls from interrupting you.

For text messages specifically, iPhone users can enable filtering in Settings > Messages > Filter Unknown Senders, which moves texts from people not in your contacts into a separate tab. Android phones with Google Messages can turn on "Spam protection" in the app settings, which automatically filters suspected spam and scam texts into a spam folder.

If a particular unknown number keeps texting you, you can still block it the same way you'd block a known contact: find the message, tap the sender's number or name, and select block. You don't need to know who they are to block them.

Unblock someone if you change your mind

You can unblock a contact at any time. On iPhone, go to Settings > Phone > Blocked Contacts (or Settings > Messages > Blocked Contacts for text-specific blocking), find the person's name, and tap "Unblock." On Android with Google Messages, open the app, tap the three dots, go to "Blocked numbers," find the contact, and tap the X or minus icon next to their name.

Once you unblock someone, they can text and call you normally again. You'll see their messages in your inbox as usual. Unblocking doesn't notify them that you've unblocked them, so they won't know unless you reach out first.

Block texts from a specific app or service

If you use messaging apps like WhatsApp, Facebook Messenger, or Signal, blocking works within that app, not through your phone's settings. Open the conversation with the person you want to block, tap their name or profile, and look for a "Block" option. Each app handles it slightly differently, but the principle is the same: you're preventing that person from contacting you through that specific service.

Blocking someone in WhatsApp, for example, stops them from seeing your profile picture, status updates, and last seen time, in addition to preventing messages. Blocking in Facebook Messenger prevents them from sending you messages or seeing when you're active. If you use multiple messaging apps with the same person, you may need to block them in each app separately.

What to do if blocking isn't enough

If someone continues to contact you from different numbers after you've blocked them, or if the messages feel threatening or harassing, blocking alone may not be sufficient. Save the messages as evidence, take screenshots with dates and times visible, and consider reporting the behavior to your phone carrier or local police if it escalates.

Most phone carriers have abuse reporting tools. You can contact your carrier's customer service and ask about reporting harassment or spam. If the messages are threatening or contain explicit content, you can also report them to the National Center for Missing & Exploited Children (NCMEC) through the CyberTipline, or to local law enforcement. Keep records of all contact attempts, even after you've blocked the person, in case you need to show a pattern of harassment.

Frequently Asked Questions

Can someone tell if I've blocked them?

Not directly. They won't receive a notification saying you blocked them. However, if they try to text you repeatedly and never get responses, or if they call and the behavior seems unusual, they may suspect they're blocked. There's no way for them to know for certain without trying to contact you.

If I block someone, can they still see my profile or status?

On regular text messaging, blocking only affects messages and calls. On messaging apps like WhatsApp or Facebook Messenger, blocking also hides your profile picture, status, and last seen time. The rules vary by app, so check the app's settings if you want to know exactly what a blocked person can or cannot see.

What if the person texts me from a different number?

Blocking only affects the specific number or account you blocked. If they contact you from a different phone number or create a new account on a messaging app, you'll receive those messages. You can block the new number or account the same way you blocked the first one. If this becomes a pattern, it may be harassment, and you should document it and consider reporting it.

Will blocking delete our old conversation history?

No. Blocking prevents future messages from arriving, but it doesn't erase past conversations. You can still see the old messages in your chat history. If you want to remove the conversation entirely, you need to delete it separately after blocking.

Can I block someone without them knowing my phone number?

If you're blocking them through a messaging app like WhatsApp or Signal, they already have your number or account information, so blocking won't hide that. If you're blocking a text message from an unknown number, they may not know your number either way — blocking just prevents their future messages from reaching you.