How To Block A Number On Android

Tips
1

I keep getting repeated spam and harassment calls from the same number on my Android phone, and it’s becoming really disruptive. I’ve checked my phone settings but I’m not sure which options actually stop calls and texts or if it depends on my phone model or carrier. Can someone explain the simplest reliable way to block a number on Android, and if possible, how to unblock it later if I need to?

2

Here is what usually works on Android. Steps vary a bit by brand, so I’ll split it out.

  1. Using the Phone app (most common way)

On most phones:

  1. Open the Phone app.
  2. Go to Recent calls / Call history.
  3. Find the spam number.
  4. Long press on the number.
  5. Tap Block / Block number / Block & report spam.
  6. Confirm.

On Google Pixel:

  1. Phone app.
  2. Recents.
  3. Tap the number.
  4. Tap the 3 dots in the top right.
  5. Tap Block.
  6. Optionally check “Report as spam.”

On Samsung:

  1. Phone app.
  2. Recents.
  3. Tap the number.
  4. Tap the “i” info icon.
  5. Tap Block.
  6. Confirm.

This usually stops both calls and SMS from that number through the default Phone and Messages apps.

  1. Block through Settings

If you do not see the number in recents or you want to type it in:

On Google Pixel or stock-ish Android:

  1. Phone app.
  2. Tap the 3 dots in the top right.
  3. Tap Settings.
  4. Tap Blocked numbers.
  5. Tap Add a number.
  6. Enter the spam number.
  7. Save.

On Samsung:

  1. Phone app.
  2. Tap the 3 dots.
  3. Tap Settings.
  4. Tap Block numbers.
  5. Add the number manually or from Recents / Contacts.
  1. Turn on spam filtering

This helps with future junk.

On Google Phone app:

  1. Phone app.
  2. 3 dots.
  3. Settings.
  4. Caller ID & spam.
  5. Turn on “Filter spam calls.”
  6. Turn on “See caller and spam ID.”

On Samsung:

  1. Phone app.
  2. 3 dots.
  3. Settings.
  4. Enable “Caller ID and spam protection.”
  5. Set it to “Block all spam and scam calls” or similar.

When this is on, many spam calls get auto blocked or at least flagged on screen.

  1. Block with your carrier

If they still get through, carriers in the US have their own spam tools.

Examples:
Verizon
• App: “Call Filter”
• Lets you auto block high risk spam, set custom block lists.

AT&T
• App: “AT&T ActiveArmor”
• Auto blocks fraud calls, flags suspected spam.

T-Mobile / Metro
• App: “Scam Shield”
• Identifies and blocks known scam numbers.

Install your carrier’s app from Play Store. Turn on:
• Auto block scam
• Auto block high risk or “red” spam
• Custom block list, add your problem number

Carrier level blocking works before the call hits your phone.

  1. Report the number

Helps build spam databases.

• If you see “Report spam” when blocking in the Phone app, check it.
• For SMS, in Messages, open the thread, tap 3 dots, tap “Details” or “Block & report spam.”

In the US, for harassment or obvious scam:
• Forward spam texts to 7726 (SPAM). Most carriers support this.
• For serious harassment, keep screenshots and logs, then talk to your carrier and local police if it escalates.

  1. Extra apps (optional)

If the built in tools are not enough, you can try third party apps. Look for:
• High Play Store rating.
• Clear privacy info.
• Examples: Truecaller, Hiya.

They use large spam databases. You add the number to their block list too.

  1. Double check that calls and texts are blocked

After blocking:
• Ask someone with a different phone to call you from that number if possible. Or wait for the next spam hit and see what happens.
• On many phones, blocked calls show in call history with a blocked icon, but your phone does not ring.
• Blocked SMS either fail silently or go to a spam folder, depending on app.

  1. If it is harassment, not spam

If this is a person you know, or targeted harassment:
• Block number as above.
• Also block in any chat apps where they reach you, like WhatsApp, Telegram, Signal, etc.
• Save messages and call logs. Take screenshots with timestamps.
• Talk to your carrier support. Some carriers can change your number or apply extra filters.
• For threats or stalking, report to local law enforcement and give them the logs.

  1. Quick checklist for you

Do these in order:

  1. Block the number in the Phone app.
  2. Turn on spam filtering in Phone settings.
  3. Turn on your carrier’s spam blocking app.
  4. Report the number as spam.
  5. If harassment continues from new numbers, start collecting evidence and talk to carrier and police if needed.

If you say your phone brand and model, people here can post exact menu names for your device, since Android UIs like to rearrange things every other version.

3

Couple of extra angles on top of what @sterrenkijker already covered, especially since this is harassment and not just random spam:

  1. Make sure texts are really blocked
    Blocking in the Phone app usually handles calls and SMS, but not always if you changed your default SMS app. Check which app is your default for texts:

    • Settings → Apps → Default apps → SMS app
      Open that app’s conversation with the number and use its own “Block” or “Details → Block & report spam” option. Some third‑party SMS apps ignore the system block list.

  2. Silence unknowns if they keep switching numbers
    This is more aggressive, but it stops a lot of harassment patterns:

    • Pixel & some others: Settings → Sound & vibration → Do Not Disturb → People → Calls → “Contacts only.”
    • Samsung: Settings → Notifications → Do Not Disturb → Calls → “From contacts only.”
      You still see the calls in your log, but your phone won’t ring for anyone not in contacts. Friends, work, etc. should be in your contacts or they’ll get silently ignored too, so this is a tradeoff.

  3. Lock down messaging apps separately
    Harassers often pivot to WhatsApp, Messenger, Telegram, etc. Blocking at the Android level does not stop those. You have to block the number/account in each app manually in its privacy or chat settings.

  4. Change your voicemail behavior
    Even when blocked, some callers dump straight to voicemail. If you’re getting nasty messages there, consider:

    • Clearing voicemail greeting so there’s less personal info.
    • Asking your carrier to reset or temporarily disable voicemail, if that’s an option.
      Not ideal, but it removes one place they can leave abuse.

  5. Evidence, not just blocking
    For real harassment (threats, stalking, ex, etc.), do not just delete everything:

    • Screenshot messages with timestamps.
    • Export call logs if your Phone app allows it, or photograph the log.
    • Write down dates/times when it happens.
      Then, if this escalates, you have something solid for your carrier’s fraud/abuse team and for law enforcement. Carriers can sometimes change your number without fees in harassment cases, but they are a lot more helpful when you show patterns instead of “this is annoying.”

  6. Number change as a last resort
    People often say “just change your number” like that’s easy. It’s actually a pain, but if this person knows your current number and refuses to stop, it can be the cleanest break. If you do:

    • Give the new number only to people you trust.
    • Do not post it publicly.
    • Update 2FA numbers on important accounts first so you don’t lock yourself out.

  7. One thing I half‑disagree with
    I’d be cautious about installing a bunch of third‑party “caller ID / spam blocker” apps unless you really need them. A lot of them slurp your contacts and call history. If your phone’s built‑in spam filter + carrier tools do the job, that’s usually safer. If you do use one, stick to a single well‑known option and lock down its permissions.

If you drop your exact phone model and country, people can usually tell you the exact menu names, because Android loves hiding these options in slightly different spots on every device and version.