Block Spam Calls on iPhone

  1. 1

    Enable Silence Unknown Callers

    Go to Settings → Phone → Silence Unknown Callers and turn it on. Calls from numbers not in your contacts go straight to voicemail. This stops the vast majority of spam calls instantly.

  2. 2

    Block a specific number

    Open the Phone app → Recents → tap the i icon next to the number → scroll down → Block this Caller.

  3. 3

    Use a call screening app

    Apps like Hiya, Robokiller or Truecaller identify and block spam before it rings. Hiya has a solid free tier.

Block Spam Calls on Android

  1. 1

    Enable spam protection

    Open the Phone app → tap the three dots (top right) → Settings → Caller ID and Spam → turn on Filter Spam Calls.

  2. 2

    Block a specific number

    Open the Phone app → Recents → tap and hold the number → Block or Report as Spam.

  3. 3

    Use Google Phone app

    If your phone has the Google Phone app, it has excellent built-in spam detection. Enable it in Phone → Settings → Spam and Call Screen.

Register with the Do Not Call listIn Australia, register at donotcall.gov.au. In the US, register at donotcall.gov. This reduces legitimate telemarketing but does not stop illegal robocallers.

For Persistent Spam Callers

If the same number keeps calling from slightly different numbers, a call-blocking app with a crowdsourced spam database (like Hiya or Truecaller) is your best bet — they update their block lists daily.

Frequently Asked Questions

Possibly — doctors, businesses and government agencies may call from numbers not in your contacts. With Silence Unknown Callers on, legitimate callers will leave a voicemail which you can call back. Most people find the tradeoff worth it.
Reputable apps like Hiya, Truecaller and Robokiller are safe and widely used. Be cautious of less-known apps as some request excessive permissions. Stick to highly-rated apps with millions of downloads.