What blocking does and where you can do it
Blocking stops someone from contacting you, seeing your posts or profile, and in some cases, finding you through search. The exact effect depends on what you're blocking them from — your phone, email, a social media account, or a messaging app. On most platforms, the blocked person won't get a notification that you blocked them, though they may figure it out if they try to message you or visit your profile and can't.
You can block people on nearly every device and service you use: your phone's contacts and messaging apps, email providers like Gmail, social media platforms like Facebook and Instagram, messaging apps like WhatsApp and iMessage, and gaming or streaming services. Each one has its own blocking feature in a slightly different place, but the principle is the same — you find the person and select a block or restrict option.
Blocking is different from muting or unfriending. When you mute someone, you still follow them but don't see their posts. When you unfriend someone on Facebook, they can still see your public posts and message you unless you also block them. Blocking is the strongest privacy tool available on most platforms.
Key Takeaways
- Blocking prevents someone from contacting you, seeing your profile, and in most cases, finding you through search on that platform.
- The blocked person typically won't receive a notification, but they may discover the block by trying to message you or visit your profile.
- Each platform stores its block list separately — blocking someone on Facebook does not block them on Instagram, WhatsApp, or your phone.
- You can unblock someone at any time, and blocking does not delete past messages or erase the conversation history on your device.
How to block someone on your phone
On an iPhone, open the Phone app, find the person's number in your recent calls or contacts, tap the info icon (the small circle with an "i"), scroll down, and tap "Block this Caller." On Android, open the Phone app, long-press the contact or number, and select "Block number." Both phones also let you block contacts through your Messages app — on iPhone, swipe left on the conversation and tap "Block"; on Android, long-press the conversation and tap "Block."
When you block a number on your phone, that person's calls and text messages won't reach you, and you won't see notifications from them. The calls go to voicemail (though some phones let you send them straight to voicemail without ringing). Text messages are silently deleted. If you change your mind, you can unblock them in the same place you blocked them — the info screen for that contact.
Blocking a phone number is device-specific. If you have an iPhone and an iPad, you need to block the number on each device separately. If someone calls from a different number, the block won't apply to that new number.
How to block someone on email
In Gmail, open an email from the person you want to block, click the three-dot menu at the top right, and select "Block [name]." In Outlook, right-click the email and choose "Block." In Apple Mail on a Mac, select the email and go to Mail menu > Junk Mail > Block Sender. On iPhone, swipe left on the email and tap the trash icon, then tap "Block this Contact" when prompted.
When you block someone's email address, their messages go directly to your spam or junk folder, and you won't see notifications. You won't see their name in your contacts, and they can't see whether you've read their messages. Blocking an email address does not prevent them from sending you mail — it just hides it from your inbox.
If someone emails you from multiple addresses, you'll need to block each address separately. Some email providers let you block entire domains (like all addresses ending in @example.com), but this is less common and usually found in advanced settings.
How to block someone 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 dots, and choose "Block." On Twitter/X, tap the three dots on their profile and select "Block @[username]." On TikTok, tap the three dots on their profile and select "Block." On Snapchat, long-press their name in your friends list and tap "Block."
On WhatsApp, open the chat with the person, tap the three dots, and select "Block Contact." On iMessage, swipe left on the conversation and tap "Block." On Discord, right-click the person's name and select "Block User." On Telegram, open their profile, tap the three dots, and select "Block User."
When you block someone on a social media platform or messaging app, they can't message you, see your profile or posts, find you through search, or see your status updates. On most platforms, they also can't see your profile picture or last-seen time. The exact restrictions vary — for example, on Facebook they can still see your public posts if they're not logged in, but they can't comment or message you.
What happens to past messages and conversations
Blocking someone does not delete your conversation history with them. On your phone, in email, or on social media, the old messages stay in your inbox or chat list unless you manually delete them. You can still read them, but the blocked person can't send you new messages or see that you've read the old ones.
If you unblock someone later, the conversation history reappears and they can message you again. Some platforms let you delete the conversation separately from blocking — for example, on WhatsApp you can delete a chat while keeping the person blocked, or block them while keeping the chat visible to you.
How to unblock someone
To unblock someone on your iPhone, go to Settings > Phone > Blocked Contacts, find their name, and swipe left and tap "Unblock." On Android, open the Phone app, tap the three-dot menu, go to Settings > Blocked numbers, find the number, and tap the minus sign. On Gmail, go to Settings > Filters and Blocked Addresses, find the blocked address, and click "Unblock." On Facebook, go to Settings > Privacy > Blocked people, find their name, and click "Unblock."
Each platform stores its own block list, so you unblock someone separately on each service where you blocked them. Unblocking them on Instagram does not unblock them on WhatsApp or your phone. Once you unblock someone, they can message you, see your profile, and find you through search again — but they won't be notified that you unblocked them.
When blocking might not be enough
Blocking stops someone from contacting you through one channel, but it doesn't stop them from creating a new account, using someone else's phone number, or reaching you through a different app. If someone is harassing you across multiple platforms or phone numbers, blocking alone may not solve the problem. In those cases, you may want to report them to the platform for harassment, document the messages, and contact local law enforcement if the behavior is threatening.
Some platforms have stronger tools than blocking. On Facebook and Instagram, you can use "Restrict" to limit what someone sees without them knowing you've restricted them. On Twitter, you can make your account private so only approved followers see your posts. On most platforms, you can also report someone for harassment, which may result in their account being suspended or removed.
Frequently Asked Questions
Can someone tell if I've blocked them?
They won't get a notification, but they may figure it out if they try to call or message you and the message doesn't go through, or if they visit your profile and can't see it. On some platforms like Instagram, they might notice your profile is no longer visible in search or that they can't see your posts anymore.
If I block someone, can they still see my old posts or messages?
It depends on the platform. On Facebook, blocked people can't see your profile or posts at all. On Instagram, they can't see your profile or posts. On Twitter, if your account is public, they can still see your tweets unless you delete them. On messaging apps like WhatsApp, they can't see your status or last-seen time, but old messages in the conversation remain visible to them if they had already seen them.
What's the difference between blocking and muting?
Blocking stops someone from contacting you and seeing your profile. Muting hides their posts from your feed but you remain connected — they can still see your posts and message you. Muting is useful if you want to avoid someone's content without cutting off contact entirely.
If I unblock someone, will they know?
No, they won't receive a notification that you unblocked them. They'll only know if they try to contact you and the message goes through, or if they visit your profile and can see it again.
Can I block someone without them knowing my phone number or email?
Yes. On social media and messaging apps, you can block someone based on their username or profile alone — you don't need their phone number or email. On your phone or email, you need their number or email address to block them, but blocking them doesn't reveal your information to them.