If you’re getting spam calls, robocalls, or someone keeps bothering you, T-Mobile gives you multiple ways to block numbers on both iPhone and Android. Below is a clear, practical guide with the exact steps that actually work in the U.S.

1. Block a Number Directly on Your Phone

On iPhone

  • Open Phone.
  • Go to Recents.
  • Tap the i next to the number.
  • Select Block this Caller.

This blocks calls, texts, and FaceTime from that number.

On Samsung / Android

  • Open the Phone app.
  • Tap Recents.
  • Choose the number → tap Block.

2. Use T-Mobile Scam Shield (Best for Spam & Robocalls)

T-Mobile’s official tool for stopping spam calls works on all smartphones. It’s free and surprisingly effective compared to basic system-level blocking.

How to Enable Scam Shield

  • Install the T-Mobile Scam Shield app (iOS / Android).
  • Open the app and sign in with your T-Mobile account.
  • Turn on:
    • Scam Block
    • Scam ID
    • Caller ID (if included in your plan)

When “Scam Block” is activated, T-Mobile blocks known scam numbers before your phone even rings.

3. Block Private or Unknown Callers

On iPhone

  • Go to Settings → Phone.
  • Turn on Silence Unknown Callers.

On Android

  • Open Phone → Settings.
  • Select Blocked numbers.
  • Enable Block calls from unidentified callers.

Great for stopping spammers who constantly use new numbers.

4. Use T-Mobile’s Line-Level Blocking (Works on All Devices)

If you want network-level blocking—not just on the device—use your T-Mobile account settings.

Steps

  • Go to my.t-mobile.com → log in.
  • Select your line.
  • Look for Privacy & Security or Scam Shield.
  • Add numbers to your line’s blocked list.

This blocks calls even if the SIM is moved to another device.

5. Block Calls Through Digits App

If you use T-Mobile DIGITS, you can block callers directly inside the app.

  • Open DIGITS.
  • Select the line you’re managing.
  • Go to Call Settings → Blocked Numbers.

6. Enable Do Not Disturb with Allowed Contacts Only

This doesn’t block numbers, but it prevents unwanted calls from ringing.

On iPhone

  • Go to Settings → Focus.
  • Select Do Not Disturb.
  • Allow calls from Favorites only or selected contacts.

On Android

  • Go to Settings → Notifications.
  • Select Do Not Disturb.
  • Choose who can contact you.

When Blocking Doesn't Work

If a number still gets through, try these:

  • Update your phone software.
  • Clear Phone app cache (Android).
  • Reinstall T-Mobile Scam Shield.
  • Restart the device and retry blocking.

Final Tips

For heavy spam callers, turning on T-Mobile’s network-level Scam Block usually delivers the best results. Device blocking works fine for one-off numbers, while app-level blocking helps keep things cleaner if you receive dozens of spam calls a week.

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