How to Block and Filter Spam SMS Texts in South Africa

Your parcel is held at the depot, you have won a cash prize, your bank account will be suspended today — all before breakfast, all by text message. Spam SMS is one of the most persistent annoyances on South African phones, and unlike spam calls, texts sit in your inbox demanding attention. Some are merely irritating marketing; others are smishing attempts designed to steal your banking details or get you to call back a premium-rate number. Here is how to filter them out and hit back at the senders.

Know the two kinds of spam SMS

• Marketing spam: loan offers, vaping shops, debt review, adult content, betting promos. Usually from short codes or alphanumeric sender names. Annoying, mostly legal-adjacent, and often traceable.
• Smishing (SMS phishing): texts impersonating your bank, a courier, SARS, or a government department, urging you to tap a link or share a one-time PIN. These are criminal attempts, and tapping the link can lead to fake login pages that harvest your credentials.

The blocking technique is similar for both, but smishing deserves a report to the authorities on top of the block. When in doubt about which one you received, treat it as smishing: do not tap, do not reply, do not call any number in the message.

Filter spam SMS on Android

Google Messages, the default SMS app on most Android phones, has built-in spam protection:

1. Open Messages and tap your profile icon (or the three-dot menu), then Settings.
2. Go to Spam protection and make sure it is turned on. Suspected spam is filtered automatically and you can review it under Spam & blocked.
3. To block a specific sender, open the conversation, tap the three-dot menu, and choose Block, optionally ticking Report spam.

Samsung Messages offers similar options under its own settings menu. Keep your messaging app updated, since spam-detection improvements arrive through app updates rather than system upgrades.

Filter spam SMS on iPhone

iOS separates unknown senders from your real conversations:

1. Go to Settings → Messages and turn on Filter Unknown Senders. Texts from numbers not in your contacts move to a separate Unknown Senders tab, without notifications.
2. In iOS 17 and later, check Settings → Messages → Unknown & Spam for additional filtering options your carrier may support.
3. To report junk sent to a South African number via iMessage-style filtering, open the message and tap Report Junk underneath it (this appears for unknown senders), then delete the thread.
4. To block a sender entirely, tap the number at the top of the conversation, tap Info, then Block this Caller.

One caution: delivery drivers, banks, and two-factor codes also arrive from unknown senders, so glance at the Unknown Senders tab when you are expecting something.

Never engage with the message

Every interaction teaches spammers that your number is live and monitored:

• Do not reply STOP to criminals. The STOP mechanism only works with legitimate bulk senders bound by industry rules. Replying to a smishing text confirms your number is active and invites more.
• Do not tap links. Preview the message, but open nothing. If it claims to be your bank or a courier, open that company's official app or type its address yourself.
• Do not call numbers in the text. Smishing texts often include a "helpline" that connects to the scammers. Look up the real number independently.
• Do not forward chain warnings blindly, but do keep the original message — screenshots and sender details help when you report it.

For genuine marketing spam from identifiable South African companies, replying STOP or using the sender's opt-out link is reasonable. The skill is telling the two apart: a text from your actual bank's usual sender ID about a service you use is one thing; a "parcel fee" link from a random long number is quite another.

Identify the sender with the WASPA lookup

South Africa has a useful tool most people never hear about. The Wireless Application Service Providers' Association (WASPA) runs a number lookup tool (part of its Codes Project) that identifies the company behind SMS short codes and sender IDs registered with it. If the spam came from a registered sender, you get contact details — which means you can demand removal from the database or lodge a formal complaint through waspa.org.za.

If the sender is not registered with WASPA, that is itself a red flag worth including in any report you file. Either way, you have turned an anonymous annoyance into documented evidence.

Report it through the right channel

• Your carrier. Vodacom, MTN, Cell C, and Telkom each have fraud and spam reporting channels — check your carrier's app or support pages. Many carriers accept spam forwarded to 7726 (SPAM), but confirm yours supports it first.
• WASPA. Lodge a complaint on the official waspa.org.za site for spam from its members; the association can sanction senders that breach its code of conduct.
• ICASA. The Independent Communications Authority of South Africa handles consumer complaints about electronic communications, including persistent spam. See its official site for the complaints process.
• Your bank's fraud line. If a text impersonates Standard Bank, FNB, Absa, Nedbank, Capitec, or any other bank, forward the details to that bank's real fraud team (find the number on your card or in the banking app, never in the SMS). Banks track impersonation campaigns and use reports to warn other customers.

Keep the message, the sender ID, and the date. A report with evidence gets action; a report from memory often does not.

Set up a quieter inbox for good

Spam texts will keep evolving — sender names change weekly and smishing lures follow the news. But the combination of automatic filtering, disciplined non-engagement, sender identification, and consistent reporting shifts the balance back to you. Enable the filters today, report the worst offenders this week, and your message inbox can go back to being boring — which is exactly what an inbox should be.