How to Block Spam Calls on Android and Stop Scam Callers

Unknown numbers, loan sharks, fake “bank” agents and endless promo calls can make your phone feel like it belongs to someone else. The good news is that you can block spam calls on Android with tools that are already on your phone. This guide shows you how to filter spam calls automatically, block single numbers, stop promotional messages in Nigeria and protect yourself from phone scams.

Why you get so many unwanted calls

Your number spreads in more places than you think. You share it with shops, banks, loan apps, delivery riders and online forms. Some of these lists get sold or leaked. Robocall systems also dial random numbers to find active lines. Once your number answers, it is often added to more lists.

That is why the best defence combines three things: automatic filtering, manual blocking and a do-not-disturb request to your network.

How to block spam calls on Android with the Google Phone app

Many Android phones, including Pixel and some Tecno, Infinix and Xiaomi models, use the Google Phone app. Follow these steps:

1. Open the Phone app.
2. Tap the three dots at the top, then Settings.
3. Tap Caller ID & spam.
4. Turn on See caller and spam ID.
5. Turn on Filter spam calls so suspected spam never rings your phone.

Filtered calls still appear in your call history, so you can check later if a real caller was caught by mistake. Google explains these options in its official Phone app help pages.

How to stop spam calls on Samsung phones

Samsung phones use their own Phone app, but the idea is the same:

1. Open the Phone app and tap the three dots.
2. Tap Settings.
3. Open Caller ID and spam protection and switch it on.
4. Go back and tap Block numbers.
5. Turn on Block unknown/private numbers if you want to stop hidden callers.

Menu names can change slightly between One UI versions. If you cannot find an option, use the search bar in Settings. Keeping your phone updated also helps, because new versions often improve spam detection. See our guide on how to update Samsung phone software.

Block a single number in seconds

Sometimes one caller keeps coming back. You can block that number directly:

1. Open the Phone app and go to Recents.
2. Tap the number, or press and hold it.
3. Choose Block or Block/report spam.

Blocked numbers can no longer call or text you. You can unblock them later from the blocked numbers list in Settings.

Stop promotional calls and texts in Nigeria

In Nigeria, many unwanted calls and messages come from promotions on your own network. The Nigerian Communications Commission runs a do-not-disturb service for this.

• Send STOP to 2442 to opt out of all promotional messages and calls.
• Your network may also offer options to opt out of specific categories only.

This works on MTN, Airtel, Glo and 9mobile. It will not stop scammers who call from personal lines, but it greatly reduces network promos.

Should you use a third-party spam calls app?

Apps that identify callers can be useful, but think about privacy first. Some of them upload your contacts to build their database. If you install one, use a well-known app from the Google Play Store, read the permissions carefully and avoid apps that ask for more access than they need.

For most people, the built-in protection on Android is enough to keep your phone quiet without sharing extra data.

How to recognise scam calls

Blocking helps, but you should still recognise a scam when it slips through. Be careful when a caller:

• says your bank account, BVN or SIM will be blocked unless you act now;
• asks for your OTP, PIN, password or card details;
• claims you won a prize you never entered for;
• pressures you to install a new app or share your screen.

Real banks never ask for your PIN or OTP on the phone. Hang up and call the official number on your card instead. To protect your accounts further, read how to protect your phone from hackers and turn on WhatsApp two-step verification.

Spam calls: what to do if you already shared details

If you gave a caller your PIN, OTP or card number, act fast. Call your bank on its official line and block the card or account. Change your passwords, starting with your email and banking apps. Then report the number as spam in your Phone app so it is flagged for other users too.

Frequently asked questions

Can I stop unwanted calls without an app?

Yes. The Google Phone app and the Samsung Phone app both have built-in spam filters and number blocking.

Will blocked numbers know they are blocked?

No. Their calls usually go straight to voicemail or end, and you will not be notified.

Why do I still get unwanted calls after blocking?

Spammers often switch numbers. Keep the spam filter on, report new numbers and use the 2442 do-not-disturb service.

Turn on the spam filter today and block spam calls on Android before they waste more of your time. A few minutes of setup gives you a quieter, safer phone.

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