Blocking stops unwanted contact at the source

Blocking prevents someone from reaching you through a specific app or service. When you block a person, they cannot call, text, or message you through that channel — the message either fails to send or disappears before you see it. Blocking is different from muting or ignoring: those let messages through to you silently, while blocking stops them entirely. The person being blocked usually knows something happened, because their message fails or they see an error.

Where you block matters. Blocking someone on your phone's native call or text app does not block them on WhatsApp, Instagram, or email — you have to block them separately in each service. This guide covers the most common blocking scenarios: phone calls and texts, email, and social media and messaging apps.

Key Takeaways

  • Blocking on your phone's call or text app only stops calls and texts through that app, not through messaging services like WhatsApp or iMessage.
  • Each service — email, Instagram, Facebook, Discord — has its own block feature, and blocking in one does not block them in another.
  • On most platforms, the blocked person cannot see your profile, send you messages, or find you in search, though they may realize they are blocked.
  • If someone creates a new account to contact you after being blocked, you can block the new account the same way, but the service cannot prevent account creation.

Blocking calls and text messages on your phone

On an iPhone, open the Phone app, find the contact or recent call from the person you want to block, tap the information icon (a circle with an "i"), scroll down, and tap "Block this Caller." For texts, open Messages, swipe left on the conversation, tap "More" (three dots), then "Block." On Android, the steps vary by manufacturer and phone model, but the general path is: open Phone or Messages, find the contact, tap and hold it, then select "Block" or "Block number" from the menu.

After you block a number, calls from that person go straight to voicemail and texts do not appear in your inbox. The person calling or texting will not hear a message saying they are blocked — the call will ring on their end and then go to voicemail, or the text will appear to send but you will never see it. Some carriers also let you block numbers through their own apps or websites, which can block calls across all devices on your account.

If the person calls from a different number, that new number is not automatically blocked. You will have to block each number separately. If blocking is not stopping the calls, the person may be spoofing their number (making calls appear to come from a different number), in which case your carrier's spam-blocking tools may help more than manual blocking.

Blocking email addresses

In Gmail, open an email from the person you want to block, click the three-dot menu at the top right, and select "Block [sender]." The sender's future emails go to spam automatically. In Outlook, right-click the email, select "Junk," then "Block Sender." In Apple Mail on a Mac, select the email and go to Mail menu > Junk Mail > Add Sender to VIP List is not the right action — instead, select the email and use Mail > Block Sender. On iPhone Mail, swipe left on the email and tap the trash icon, then flag it as junk if the option appears.

Blocking an email address sends their future messages to your spam folder, but they can still send emails — the emails just will not reach your inbox. If someone creates a new email address and continues contacting you, you will need to block that address separately. Some email services let you create filters or rules that automatically delete or move emails from certain addresses, which is more aggressive than blocking but requires manual setup.

Blocking on social media and messaging apps

On Facebook, go to the person's profile, click the three-dot menu, and select "Block." On Instagram, go to their profile, tap the three-dot menu, and select "Block." On Twitter (now X), tap the three-dot menu on their profile and select "Block." On TikTok, tap the three-dot menu on their profile and select "Block user." On Snapchat, long-press their name in your contacts and select "Block."

For messaging apps: on WhatsApp, open the chat, tap the contact name at the top, scroll down, and tap "Block Contact." On iMessage (Apple's texting service for iPhone to iPhone), open the conversation, tap the contact name at the top, tap "Info," scroll down, and tap "Block this Caller." On Discord, right-click the person's name and select "Block." On Telegram, open the chat, tap their name, and select "Block User."

When you block someone on social media or messaging apps, they usually cannot see your profile, find you in search, or send you messages. On some platforms like Instagram and Facebook, they may still be able to see your old posts or comments if they were already visible before the block, but they cannot interact with new content. The blocked person often realizes they are blocked because they cannot find your profile or their messages fail to send.

What happens after you block someone

After blocking, the blocked person's messages, calls, or emails do not reach you. On most platforms, they cannot see that you have read their messages or that you are online. They may not receive a notification that you blocked them, but they will notice when their messages fail to send, their calls go to voicemail, or they cannot find your profile.

Blocking is not permanent — you can unblock someone at any time by reversing the same steps. On your phone, go to Settings > Phone (or Messages) > Blocked Contacts and tap "Edit" or the minus sign next to the contact. On email, you usually have to go to spam settings and remove them from the blocked list. On social media, go back to their profile and select "Unblock."

If someone you blocked creates a new account to contact you, that new account is not automatically blocked. You will have to block the new account separately. Some platforms have tools to report harassment or repeated contact after blocking, which can result in the person's account being suspended or removed.

Blocking versus other ways to stop contact

Muting is different from blocking. When you mute someone on most platforms, you still receive their messages and calls, but you do not get notifications — their messages sit in your inbox silently. Muting is useful if you want to avoid constant notifications from someone but do not want to completely cut off contact. Blocking is stronger: the person cannot reach you at all.

Ignoring or archiving a conversation also differs from blocking. On Facebook Messenger or Instagram Direct Messages, you can ignore a message thread, which moves it out of your main inbox but does not prevent the person from sending more messages. Archiving does the same thing. Blocking prevents them from sending messages in the first place.

Do Not Disturb or Focus modes on your phone silence notifications from everyone or specific contacts, but they do not block calls or texts — the messages still arrive, you just do not see them until you turn off the mode. If you want to truly stop contact, blocking is the only option.

Frequently Asked Questions

Can someone tell if I blocked them?

They usually figure it out. On most platforms, their messages fail to send or they get an error. On social media, they cannot find your profile or see your posts. They will not receive a notification that says "you have been blocked," but the signs are obvious. On phone calls, their call goes to voicemail every time, which can feel like blocking even if it is not.

If I block someone, can they still see my old posts or messages?

It depends on the platform. On Facebook and Instagram, they usually cannot see your profile or posts at all after you block them. On Twitter, they can still see your public tweets unless you have a private account. On messaging apps like WhatsApp, they cannot see your profile picture, status, or last seen time after you block them. Check the specific platform's privacy settings if you want to know exactly what they can see.

What if someone keeps contacting me from different numbers or accounts?

Block each new number or account as it appears. If the harassment continues, report it to the platform or your phone carrier. Most services have abuse reporting tools that can suspend or remove accounts that repeatedly try to contact someone after being blocked. Your phone carrier can also help with repeated calls from spoofed numbers.

Does blocking someone delete our old messages?

No. Blocking stops future contact but does not erase the conversation history. You can still see old messages from the blocked person in your inbox or chat history. If you want to delete the conversation, you have to do that separately — blocking and deleting are two different actions.

Can I block someone without them knowing my phone number or email?

Yes, on social media and messaging apps. You can block someone on Instagram, Facebook, or Discord without them ever having your contact information. On phone calls and texts, they already have your number to contact you, so blocking is a response to contact they have already made. On email, they already have your address.