When you block a number, that person can no longer reach you by call or text, but they won't get a notification that they're blocked
Blocking a number stops incoming calls and text messages from that contact. On most phones, their calls go straight to voicemail (if you have voicemail set up), and their text messages either disappear into a separate folder or vanish entirely, depending on your phone type. The person calling or texting has no way to know they've been blocked — they won't see a message saying "this number is blocked" or get any alert from your phone company.
What actually happens behind the scenes is simpler than many people think. Your phone recognizes the blocked number and refuses to ring or notify you. That's it. There's no special technology involved, no record sent to your carrier, no flag on your account. It's a feature that lives entirely on your device.
Key Takeaways
- Blocked calls go to voicemail without your phone ringing, and blocked texts typically go to a hidden folder or disappear entirely.
- The person who is blocked will not receive any notification that they've been blocked — they'll just notice their calls and texts aren't getting through.
- Blocking works only on the device where you set it up; if you have multiple phones or tablets, you'll need to block the number on each one separately.
- Your phone company has no role in blocking — it's a feature your phone handles on its own, so blocking doesn't appear on your bill or account.
- Unblocking a number is just as straightforward as blocking it, and the person won't know they were ever blocked once you unblock them.
How blocking works on iPhone versus Android
On an iPhone, when you block a number through the Phone app or Messages app, that contact can still try to call or text you, but your phone straightforward ignores the attempt. Their calls go straight to voicemail, and their texts land in a separate "Blocked" folder that you can view if you want to. If they leave a voicemail, it shows up in your voicemail list but is marked as blocked.
Android phones work similarly, though the exact behavior depends on which Android phone you have and which version of Android it runs. On most Android devices, blocked calls go to voicemail and blocked texts either go to a hidden folder or are deleted automatically. Some Android phones let you choose what happens to blocked messages — you can have them deleted when ready, moved to a folder, or kept in your message threads but marked as blocked.
The key difference is that iPhones are more consistent across all devices, while Android behavior varies by manufacturer. A Samsung phone might handle blocking differently than a Google Pixel, even though both run Android. If you're not sure where your blocked messages go, check your phone's settings under "Blocked Contacts" or "Do Not Disturb" to see what options are available.
What the blocked person experiences
From the other person's perspective, blocking is invisible. When they call you, they hear the phone ring normally — or sometimes it goes straight to voicemail without ringing. They have no way to tell the difference between a blocked call and a call to someone who is straightforward not answering. Some people assume the phone is off, the person is busy, or the number is wrong.
If they send a text message, it typically shows as "delivered" on their end, even though you never received it. This is because your phone company delivers the message to your phone, and your phone then silently discards it. The sender sees no error message, no bounce-back, nothing to indicate the message didn't reach you. They might assume you're ignoring them, or they might not think about it at all.
The one exception is if you have an older phone or a very specific setup: some carriers or older systems might show a "message failed to send" error, but this is rare on modern phones. Most of the time, the blocked person straightforward won't know.
Blocking doesn't hide your online activity or social media
A critical thing to understand: blocking a phone number only blocks calls and texts. It does not hide you from that person on social media, email, or any other platform. If you block someone's number but you're still connected on Facebook, Instagram, or other apps, they can still see your posts, send you messages through those apps, and interact with you online.
If you want to prevent someone from contacting you completely, you may need to block them on multiple platforms. Blocking on your phone, blocking on Facebook, blocking on Instagram, and blocking on email are all separate actions. Some people block a number but forget to block the person on social media, then are surprised when the person finds another way to reach them.
Similarly, blocking a number doesn't prevent someone from calling you from a different number. If someone is determined to reach you, they can use a friend's phone, a work phone, or a different personal number. Blocking is a deterrent, not an absolute barrier.
When blocking stops working and what to do instead
If you block someone and they keep reaching you from different numbers, blocking each new number individually becomes exhausting. At that point, you have other options. Most phones have a "Do Not Disturb" mode that silences all calls and texts except from contacts you've marked as favorites. You can also set up a contact filter through your phone company.
Many carriers offer call-filtering services — Verizon has Call Filter, AT&T has Call Protect, and T-Mobile has Scam Shield. These services can block calls from unknown numbers, spam numbers, or numbers you've reported. They cost money on some carriers and are free on others, so check with your provider about what's available on your account.
If someone is harassing you repeatedly from multiple numbers, that's a situation to report to local police. Harassment and stalking are crimes, and law enforcement can take action that goes beyond what your phone can do. Keep records of the calls and texts, note the dates and times, and bring that information to the police.
Blocking and voicemail: what you need to know
When you block a number, calls from that contact go to voicemail if you have voicemail set up. The blocked person can leave a message, and that message will appear in your voicemail inbox — but it will be marked as coming from a blocked contact. You can listen to it if you want, or you can delete it without listening.
If you don't have voicemail set up, a blocked call straightforward fails. The person hears a message saying the call couldn't go through, or the call just drops. They might think your phone is off or that there's a network problem.
One thing blocking does not do: it doesn't prevent the person from leaving voicemail messages. If they're determined, they can keep calling and leaving messages. You can delete those messages, but you can't prevent them from being left. If voicemail harassment is the problem, you may need to turn off voicemail entirely or change your voicemail settings to reject calls from unknown numbers.
How to unblock a number and what happens next
Unblocking a number is as straightforward as blocking it. On iPhone, go to Settings, then Phone, then Blocked Contacts, find the number, and tap "Unblock." On Android, the process varies by phone, but it's usually in Settings under Blocked Numbers or Blocked Contacts. Once you unblock someone, they can call and text you normally again.
The person you unblock won't know they were ever blocked. They won't get a notification saying "you've been unblocked." If they tried to reach you while they were blocked and their calls went to voicemail, they might assume you were just busy or not answering. Once unblocked, everything works as if the blocking never happened.
If you unblock someone by accident, you can block them again when ready. There's no waiting period or limit to how many times you can block and unblock the same number.
Frequently Asked Questions
Can someone tell if I blocked them?
Not directly from your phone. They won't get a message saying they're blocked. However, if they call repeatedly and always get voicemail, or if their texts never get responses, they might suspect they've been blocked. But there's no technical way for them to know for certain.
Will blocking a number stop spam calls?
Blocking one spam number will stop calls from that specific number, but spammers often use different numbers each time. For widespread spam, use your carrier's call-filtering service or a third-party app designed to block spam. These tools recognize patterns in spam calls rather than relying on you to block each number individually.
If I block someone, can they still see my location or access my photos?
Blocking a phone number has nothing to do with location sharing or photo access. If you've shared your location with someone through Google Maps, Find My Friends, or another app, blocking their number won't stop that sharing. You need to turn off location sharing separately in those apps. The same applies to shared photo albums or cloud storage.
Does blocking a number cost money or show up on my phone bill?
No. Blocking is a free feature built into your phone. It doesn't involve your phone company, so it won't appear on your bill or cost anything. Your carrier has no record of which numbers you've blocked.
What if I block a number and then they call from a different phone?
You'll receive the call normally because it's coming from a different number. Blocking only applies to the specific number you blocked. If someone is calling from multiple numbers to reach you, you can block each number individually, but this becomes impractical quickly. In that case, use Do Not Disturb mode or your carrier's call-filtering service instead.