Here are the most effective ways to block spam calls on your Android device.
Method 1: Enable Built-in Spam Filter (Google Phone App)
Most Android phones come with Google’s Phone app, which has a highly effective built-in spam filter that can automatically decline suspected spam calls.
Open the Phone app.
Tap the three-dot menu icon (⋮) in the top right corner.
Select Settings.
Tap on Caller ID & spam (or Spam and Call Screen).
Toggle on See caller and spam ID to identify businesses and spam numbers.
Toggle on Filter spam calls to prevent suspected spam calls from ringing your phone.
Method 2: Block a Specific Number from your Call Log
If a spammer manages to get through, you can block their specific number so they can never call or text you again.
Open the Phone app and go to the Recents tab.
Long-press the phone number or contact you want to block.
Tap Block/report spam from the pop-up menu.
Check the box to report the call as spam (optional but helpful), then tap Block.
Method 3: Block All Unknown or Hidden Numbers
You can set your phone to automatically reject calls from private, hidden, or unidentified numbers (Note: This does not block numbers that simply aren't saved in your contacts, only those hiding their caller ID).
Open the Phone app.
Tap the three-dot menu icon (⋮) > Settings.
Tap Blocked numbers.
Toggle on the switch next to Unknown.
Method 4: Samsung Galaxy Devices (Smart Call)
If you are using a Samsung device with the default Samsung dialer, the process is slightly different:
Open the Phone app.
Tap the three-dot menu icon (⋮) > Settings.
Tap Caller ID and spam protection.
Toggle it On.
Choose whether to block All spam and scam calls or only High-risk scam calls.
Method 5: Use Third-Party Apps or Carrier Services
If you are still receiving too much spam, you can add an extra layer of protection:
Carrier Apps: Many mobile carriers offer their own spam-blocking apps (e.g., T-Mobile Scam Shield, AT&T ActiveArmor, Verizon Call Filter). Check with your provider.
Third-Party Apps: Apps like Truecaller, Hiya, or Robokiller maintain massive databases of spam numbers and offer aggressive call blocking, though they require access to your call logs and contacts to function.