How to Block Spam Calls on Android and iPhone in South Africa

Your phone lights up with a Johannesburg or Cape Town number you do not recognise. You answer, and it is a recorded voice about a loan you never applied for — or silence, then a call centre agent selling insurance. South Africans deal with a steady stream of these nuisance calls, from aggressive telemarketers to outright scammers using spoofed numbers. No single setting stops all of them, but a layered approach — phone settings, carrier tools, reporting, and a blocking app — can reduce the daily noise to the occasional one-tap block.

Understand what you are blocking

Not every unwanted call is the same, and the distinction matters:

• Telemarketing calls: solar geysers, insurance, debt consolidation, retail offers. Often from real companies that bought your number from a list.
• Silent or dropped calls: usually predictive diallers from call centres that rang more numbers than they had agents for.
• Spoofed scam calls: criminals displaying a local South African number while calling from anywhere in the world. Blocking one number barely helps, because they rotate numbers constantly.
• Impostor calls: someone claiming to be your bank, your carrier, or even the police, demanding personal details or payments.

Caller ID proves nothing on its own. Spoofing a local number costs scammers almost nothing, which is why blocking individual numbers is only one layer of the plan below.

Block calls on Android step by step

On most Android phones, using Google's Phone app or Samsung's dialler:

1. Open the Phone app and go to Recents.
2. Tap the number you want to block, then tap Block (on Samsung: tap the i icon, then Block at the bottom).
3. Confirm. The number can no longer ring your phone, though it may still leave voicemails depending on your carrier.

For broader protection, turn on spam filtering:

1. In the Phone app, tap the three-dot menu and open Settings.
2. Go to Spam and Call Screen (wording varies by phone).
3. Enable See caller and spam ID and Filter spam calls so suspected spam goes straight to voicemail.

You can also block unknown callers entirely under Settings → Blocked numbers → Block unknown callers, but use this with care: doctors' rooms, schools, and couriers often call from numbers not in your contacts.

Block calls on iPhone step by step

On iOS:

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

Manage everything under Settings → Phone → Blocked Contacts. Two extra settings are worth enabling:

• Silence Unknown Callers (Settings → Phone): calls from numbers not in your contacts, recent outgoing calls, or Siri suggestions go straight to voicemail and appear in your recents list. Genuine callers can leave a message.
• Live Voicemail (on supported models and regions): lets you see a live transcript as the caller speaks, so you can decide whether to pick up.

If you run a business or expect calls from unknown numbers, Silence Unknown Callers may be too aggressive — a blocking app that labels calls instead of silencing them is a better fit.

Use your carrier's tools

Vodacom, MTN, Cell C, and Telkom all offer some form of spam management, though the exact features change over time. Check your carrier's app or customer-care channels for:

• Spam-call labelling or blocking services on your line.
• Options to bar international or premium-rate calls, which also protects against callback scams.
• Instructions for reporting spam numbers — many carriers accept spam reports forwarded to 7726 (SPAM), but confirm with your own carrier first whether it supports this.

A quick call to customer care is worth it: ask specifically what spam protection is available on your contract or prepaid line, and whether any of it needs activation.

Cut off the supply: opt out and report

Blocking treats the symptom. These steps reduce the supply of your number to legitimate-but-annoying callers:

• Ask to be removed. When a real company calls, tell them clearly to remove your number from their marketing list and note the date. Legitimate operators should comply.
• Report SMS-linked spam to WASPA. The Wireless Application Service Providers' Association (WASPA) runs a complaint process for spam sent by its members, plus a lookup tool that can identify registered SMS senders. Start at the official waspa.org.za site.
• Complain to ICASA. The Independent Communications Authority of South Africa (ICASA) is the telecoms regulator and handles consumer complaints about electronic communications services. Check its official site for the current complaints process.
• Guard your number. Every competition entry, online form, and loyalty signup is a potential new source of marketing calls. Share your number sparingly.

None of this stops criminals, who ignore every list and regulator by definition. For scam calls, reporting to the authorities matters more than opting out — see our guide on reporting spam for the full process.

Add a real-time blocking layer

Built-in tools block numbers you have already seen, but spoofers rotate through new numbers daily. Call-blocking apps such as NoCall add a live layer: incoming calls are checked against continuously updated spam and scam databases, so likely-nuisance calls are flagged or blocked before you pick up. For anyone getting several unwanted calls a week, this is usually the single change you notice most.

A routine that actually works

1. Turn on your phone's spam filter (Android) or Silence Unknown Callers (iPhone).
2. Activate whatever spam protection your carrier offers.
3. Block repeat offenders individually as they appear.
4. Report scam numbers to WASPA, ICASA, or the police instead of just blocking.
5. Let a blocking app handle the numbers you have never seen before.

No one step ends spam calling on its own, but together they turn a daily disruption into a rare, labelled, one-tap block — and every report you file makes the next scammer's job slightly harder.