How to Block Spam Calls on Android and iPhone in Nigeria

Your phone lights up with an unknown 0803 or 0905 number during lunch. You answer, and it is either a recorded marketing pitch you never signed up for or a stranger with a story that sounds slightly off. Nigerians deal with both kinds of unwanted calls every day: aggressive telemarketing and outright scam attempts. No single setting stops all of them, but a layered approach — your phone's built-in tools, your network's options, the regulator's Do-Not-Disturb service, and a blocking app — can turn a daily flood into an occasional trickle.

Know what kind of unwanted call you are getting

Not every nuisance call is the same, and the right response depends on the type:

• Marketing and promo calls: banks, betting companies, real-estate agents, and loan apps pushing offers. Annoying, but usually from real businesses.
• Robocalls: pre-recorded messages played when you pick up. Legitimate companies sometimes use them, but scammers use them far more.
• Wrong-number and silent calls: auto-diallers testing whether your line is active. Answering confirms your number is live, which can invite more calls.
• Scam calls: fake bank alerts, fake job offers, fake prize wins, and callers posing as officials. These are the dangerous ones — never share personal details with them.

If a caller pressures you for bank details, one-time codes, or urgent payments, that is not marketing. Hang up immediately.

Activate Do-Not-Disturb on your line

The Nigerian Communications Commission (NCC), the telecom regulator, requires networks to offer a Do-Not-Disturb (DND) service that stops unsolicited marketing messages and calls. Activating it is free and takes seconds:

1. Text STOP to 2442 from the line you want to protect, for full DND.
2. You will receive a confirmation message from your network.
3. Repeat the step on every SIM you use — DND applies per line, not per person.

DND mainly stops legitimate telemarketers that follow the rules. Scammers ignore it completely, so treat any marketing-style call you still receive after activating DND with extra suspicion. If marketing calls persist on a DND-activated line, you can escalate to the NCC (see the reporting section of our guides for the official channels). Check the NCC website to confirm the current DND options and codes before you rely on them.

Block calls on Android step by step

On most Android phones sold in Nigeria — Tecno, Infinix, Samsung, Xiaomi, and others — the Phone app has built-in blocking:

1. Open the Phone app and go to Recents.
2. Tap the number you want to block, then tap Block or Block/report spam.
3. Confirm. Future calls from that number will be silenced automatically.

For stronger protection:

• In the Phone app, open Settings → Caller ID & spam (wording varies by brand) and turn on Filter spam calls and See caller and spam ID. Google's Phone app will then warn you about suspected spam before you answer.
• On Samsung phones, look under Phone → Settings → Block numbers, where you can also block unknown or private numbers entirely.
• Report spam numbers when your phone offers the option — it improves filtering for everyone.

Block calls on iPhone step by step

On iPhones:

1. Open Phone → Recents.
2. Tap the ⓘ button next to the unwanted number.
3. Scroll down and tap Block this Caller, then confirm.

Manage your blocked list anytime under Settings → Phone → Blocked Contacts. Two extra settings are worth enabling:

• Silence Unknown Callers (Settings → Phone): calls from numbers not in your contacts go straight to voicemail and appear in Recents, so genuine callers — clinics, dispatch riders, schools — can still leave a message.
• Live Voicemail (on supported models and regions): lets you see a real-time transcript of a voicemail being left, so you can decide whether to pick up mid-message.

Silencing unknown callers is especially useful in Nigeria, where scam operations rotate through fresh numbers constantly and blocking them one by one never ends.

Use your network's tools and good answering habits

Nigeria's major networks — MTN, Airtel, Glo, and 9mobile — all offer some form of spam awareness and customer support for nuisance calls. Check your network's app or customer-care channels for current call-blocking or spam-reporting features, since the exact options change over time.

Just as important are your own habits:

• Let unknown numbers go to voicemail. If it matters, the caller will leave a message or send a text.
• Never call back an unknown missed call immediately, especially one that rang once — that pattern is the classic wangiri callback trap.
• Never confirm personal details on an inbound call. A real bank or agency will never mind if you hang up and call back on their official line.
• Add a blocking app such as NoCall for real-time spam detection. Built-in tools block numbers you already know are bad; a blocking app checks incoming calls against continuously updated spam databases and flags new scam numbers before you pick up.

A routine that actually works

1. Text STOP to 2442 to activate full DND on every SIM you own.
2. Turn on spam filtering (Android) or Silence Unknown Callers (iPhone).
3. Block repeat offenders individually as they come in.
4. Let unknown callers prove themselves via voicemail or SMS first.
5. Add a real-time blocking app for numbers you have never seen before.

None of these steps alone ends spam calls, but together they change the maths of your day. Most nuisance calls get filtered before they interrupt you, and the few that slip through are easier to recognise for what they are — so you can hang up, block, and get on with your life.