How to Block People on Messages: A Complete Guide for Every Device

Blocking someone on a messaging app sounds straightforward — but the exact steps, what happens afterward, and what the blocked person experiences all vary significantly depending on which platform you're using, which device you're on, and even which version of an operating system you're running. Here's a clear breakdown of how blocking works across the most common messaging environments.

What "Blocking" Actually Does in a Messaging Context

When you block someone on a messaging app, you're telling the platform to stop delivering their messages to you. Depending on the app, blocking can also:

• Prevent calls (voice and video) from that contact
• Hide your online status or last-seen timestamp from the blocked person
• Remove message delivery confirmations — so the blocked sender may see their messages as "sent" but never "delivered" or "read"
• Restrict profile visibility, so the person may no longer see your profile photo or status updates

Blocking is generally one-directional. You stop receiving their messages; they may or may not know they've been blocked, depending on how the app handles it.

How to Block on Apple Messages (iMessage/SMS) 📱

On an iPhone or iPad, blocking works at the system level, meaning it applies across calls, FaceTime, and messages simultaneously.

Steps:

1. Open the Messages app and tap the conversation with the person you want to block
2. Tap the contact's name or number at the top of the screen
3. Tap the info (ⓘ) icon
4. Scroll down and tap Block this Caller
5. Confirm by tapping Block Contact

Alternatively, go to Settings → Phone → Blocked Contacts (or Settings → Messages → Blocked Contacts) and add contacts manually.

What happens: Blocked contacts' messages go to a separate "Unknown & Spam" folder in iOS 18+ (behavior has evolved across OS versions). In earlier versions, messages simply don't arrive. The sender sees no error — their messages appear sent on their end.

On a Mac: Open Messages, right-click the conversation, and select Block Person from the context menu.

How to Block on Android Messages (Google Messages)

Android's default messaging app is Google Messages on most modern devices, though some manufacturers (Samsung, for example) use their own SMS apps with slightly different interfaces.

Steps for Google Messages:

1. Open the conversation
2. Tap the three-dot menu (top-right corner)
3. Select Details or People & Options
4. Tap Block & report spam (or just Block)
5. Confirm

Steps for Samsung Messages:

1. Open the conversation
2. Tap the three-dot menu
3. Select Block number
4. Toggle on Block messages if prompted

Key variable: Android blocking is often app-specific unless done at the carrier or device level. Blocking in Google Messages may not block calls — you'd need to handle that separately in the Phone app.

How to Block in WhatsApp

WhatsApp blocking is account-based, meaning it follows the person's phone number across devices.

Steps (iOS or Android):

1. Open the chat with the contact
2. Tap their name or number at the top
3. Scroll to the bottom and tap Block
4. Choose whether to report the contact as well (optional)

What the blocked person sees: Their messages show a single checkmark (sent) but never progress to two checkmarks (delivered). Your profile photo, status, and last seen are hidden from them. You can still see their messages in the chat history before the block.

On WhatsApp Web/Desktop: Go to the contact's profile and select Block Contact from the menu.

How to Block in Other Major Messaging Apps

Important distinction: Blocking someone in Messenger does not automatically block them on Facebook — these are managed separately. Similarly, blocking on Instagram DMs and blocking on Instagram itself are two different actions with different levels of restriction.

Variables That Change the Experience 🔍

Several factors determine exactly what happens when you block someone:

• OS version: iOS 18 introduced a filtered inbox for blocked contacts rather than silently dropping messages. Older iOS versions behave differently.
• App vs. system-level blocking: Blocking within an app (like WhatsApp) only affects that app. System-level blocking (iOS Settings or Android device settings) can span calls, SMS, and FaceTime simultaneously.
• RCS vs. SMS: If you use Google Messages with RCS enabled, blocking works differently than blocking a traditional SMS number.
• Cross-platform messaging: If someone messages you via a different app you haven't blocked them on, those messages still come through.
• Carrier-level blocks: Some carriers offer independent spam/blocking tools that operate separately from your device's built-in features.

When One Block Isn't Enough

Blocking is not always a one-step solution. A determined person can still contact you through:

• A different phone number or account
• Another platform where you haven't blocked them
• Email, if they have your address

For situations involving harassment or safety concerns, most platforms also offer a report function alongside blocking — which flags the behavior to the platform's trust and safety team.

Some users also enable silence unknown callers (iOS) or filter unknown senders (Google Messages) as a secondary layer alongside contact-level blocks.

Whether the built-in block features on your device are sufficient — or whether you need carrier-level filtering, third-party apps, or platform reporting — depends entirely on the nature of the contact, which apps you both use, and how determined the person is to reach you.