SIM Permanently Blocked

Last checked: 26 June 2026

A SIM permanently blocked message usually means the SIM security unlock process has gone too far. In most cases, the SIM PIN was entered incorrectly first, then the PUK was entered incorrectly too many times. Once the SIM reaches this stage, you should stop entering codes and use your mobile network’s official support route.

A PUK is not the same as your phone password, banking PIN, app PIN, screen lock, or SIM tray number. It is a network-issued unlock code linked to your SIM. Apple warns users not to guess a SIM PIN or PUK because repeated wrong attempts can permanently lock the SIM or eSIM, after which the network provider may need to issue a new SIM or eSIM. (Apple Support)

This guide helps you check what to do when your phone says SIM permanently blocked, PUK code not working, PUK USSD not working, wrong PUK entered, or PUK exhausted.

Quick Fixes to Try First

If your SIM is permanently blocked, the fastest safe answer is: do not keep trying random PUK codes. Check the exact message, confirm your network, then use the official provider route.

Before you contact support, prepare:

• the affected cellphone number;
• your ID or passport used for RICA;
• the SIM card number if visible on the SIM pack or SIM card;
• the account holder details if it is a contract line;
• the exact message shown on the phone;
• whether the SIM is prepaid, contract, physical SIM, or eSIM;
• any recent SIM swap, phone change, theft, loss, repair, or reset.

If you still need to retrieve the PUK, read get PUK number South Africa. If the SIM is already unusable, read how to do SIM swap South Africa. If you need direct help, use mobile network customer care numbers.

Why This USSD Problem Happens

A SIM permanently blocked issue normally happens because the SIM security process has failed too many times. MTN says a SIM locks automatically when the wrong PIN is entered three times, and the PUK is then needed to unlock it. (MTN) Vodacom states that if the PUK is entered incorrectly 10 times, the SIM becomes permanently blocked and the user needs a new SIM plus a SIM swap to keep the number. (Vodacom)

Common causes include:

• entering the wrong SIM PIN too many times;
• entering the wrong PUK;
• using a PUK from an old SIM pack;
• using a PUK for a different number;
• typing the correct PUK incorrectly;
• the SIM already being permanently blocked;
• the SIM not registering on the network;
• the provider’s USSD menu being unavailable;
• the account being suspended, restricted, replaced, or deactivated;
• confusing the SIM PUK with a phone unlock code or screen lock PIN.

Check Network and Account Status

First, check whether the SIM still connects to the network. If the phone shows No Service, Emergency Calls Only, Invalid SIM, PUK exhausted, or SIM permanently blocked, a USSD code may not open from that SIM.

Try these safe checks:

1. Restart the phone once.
2. Remove and reinsert the SIM.
3. Check whether the provider name appears on screen.
4. Try the SIM in another compatible phone if available.
5. Connect to Wi-Fi and open the provider app or website.
6. Contact customer care from another phone if the blocked SIM cannot make calls.

Retry Safely

Only enter a PUK when it comes from the correct provider account for the exact affected SIM. Do not guess. Do not use a PUK from another SIM card. Do not use a PUK found on a random website or social media post.

If the correct PUK is accepted, the phone should usually ask you to create a new SIM PIN. Choose a new PIN you can remember, but do not reuse your banking PIN, card PIN, phone password, or app password.

MTN’s official unblock guidance says users can ask an MTN agent for their PUK by dialling 135, then use the unlock format with the PUK and a new PIN. The listed MTN format is **05*PUK number*New PIN code*New PIN code#. Use this only after confirming your correct MTN PUK. (MTN)

Escalation Route

Stop trying self-service codes and escalate when:

• the phone says PUK exhausted;
• the phone says SIM permanently blocked;
• the same PUK has failed;
• you have already made several PUK attempts;
• the SIM has no network signal;
• the SIM is linked to banking OTPs, WhatsApp, business accounts, or two-factor authentication;
• the SIM was lost, stolen, damaged, swapped, or replaced;
• you suspect an unauthorised SIM swap.

If the SIM suddenly stopped working and you did not request a SIM swap, treat it as urgent. Contact your network and your bank from another phone or secure device.

Provider-Specific Checks

Use the route for the network printed on your SIM card, SIM pack, eSIM profile, or mobile account. Do not use one provider’s PUK instructions for another provider’s SIM.

Vodacom SIM Permanently Blocked

For Vodacom, first check whether the phone is still asking for a PUK or whether it already says the SIM is permanently blocked. Vodacom’s support guidance says that entering the PUK incorrectly 10 times permanently blocks the SIM and that a new SIM plus SIM swap is needed to keep the number. (Vodacom)

Safe Vodacom route:

1. Stop entering PUK codes.
2. Confirm the affected number is Vodacom.
3. Try Vodacom’s official app, online account, TOBi, customer support, or store route.
4. If the SIM still asks for PUK, retrieve the correct PUK before entering it.
5. If the SIM is permanently blocked, ask Vodacom about a replacement SIM and SIM swap.

Vodacom also publishes PUK retrieval options through the VodaPay App, *135#, SMS, and customer care, but these should only be used when they are still available to the affected SIM and verified for the current account. (VodacomNow)

MTN SIM Permanently Blocked

For MTN, check whether the SIM still accepts a PUK unlock or whether it has already failed. MTN says a SIM locks after the wrong PIN is entered three times, and the PUK is needed to unlock it. (MTN)

Safe MTN route:

1. Stop trying random PUK numbers.
2. Dial 135 from an available MTN line or contact MTN through an official channel.
3. Ask for the PUK for the affected number.
4. Use MTN’s unlock format only after the PUK is verified.
5. If the PUK is exhausted or the SIM remains blocked, ask MTN about replacement or SIM swap options.

MTN’s published unlock format is **05*PUK number*New PIN code*New PIN code#, but it should not be used with an uncertain PUK. (MTN)

Cell C SIM Permanently Blocked

Cell C lists several ways to get a PUK: the Cell C Mobile App, Cell C website self-service, 135 IVR, *147# menu route, and speaking to an agent on 135. (Cell C)

Safe Cell C route:

1. Confirm the SIM is Cell C.
2. Use the Cell C app or website over Wi-Fi if the blocked SIM cannot use USSD.
3. Try the 135 IVR or *147# only if the SIM still connects to the network.
4. Speak to an agent if the PUK route fails.
5. If the SIM is permanently blocked, ask whether a SIM swap or store visit is required.

Cell C’s published *147# PUK route is: dial *147#, choose option 9, option 5, then option 2. Verify the menu on-screen before selecting, because USSD menus can change. (Cell C)

Telkom SIM Permanently Blocked

For Telkom, use app, web, WhatsApp, or support routes if the blocked SIM cannot open USSD. Telkom lists WhatsApp self-service on 081 160 1700 for queries, including from a non-Telkom SIM. (Telkom) Telkom also lists *180# as a self-service code, but a permanently blocked SIM may not be able to use USSD. (Telkom)

Safe Telkom route:

1. Confirm the SIM is Telkom.
2. Connect to Wi-Fi and try the MyTelkom App or Telkom online support.
3. Use Telkom WhatsApp self-service from another SIM if the blocked SIM cannot connect.
4. If you can access the Telkom app, check whether the PUK is available under the account tools.
5. If the SIM is permanently blocked, ask Telkom about replacement or SIM swap steps.

Telkom’s app guidance shows a PUK route in the Telkom App: log in, tap My Account, then tap View Puk. (Online Care)

When to Use an App, Website, or Customer Care Instead

Use an app, website, WhatsApp, store, or customer care instead of USSD when the SIM cannot connect to the network or when the phone says the PUK is exhausted.

Step-by-Step Instructions

1. Read the exact message on the phone
   If it says Enter PUK, you may still be able to unlock it with the correct PUK. If it says PUK exhausted or SIM permanently blocked, do not keep trying.
2. Confirm the network
   Check the SIM card, SIM pack, phone settings, eSIM profile, or account records. Use only the provider route for that SIM.
3. Use Wi-Fi if mobile data is blocked
   The SIM may not work for calls, SMS, or USSD, but your phone may still connect to Wi-Fi. Use the provider app or website if you can log in safely.
4. Retrieve the PUK from an official source
   Use the provider app, website, official USSD menu, IVR, customer care, WhatsApp, or store. Do not use a PUK from another number.
5. Enter the PUK carefully only if the phone still allows it
   Type slowly. Check every digit. If the PUK is accepted, the phone should ask you to create a new SIM PIN.
6. Set a new SIM PIN
   Enter the new SIM PIN and confirm it. Store it safely. Do not use your bank PIN.
7. Restart and test the phone
   After unlocking, restart the phone. Test calls, SMS, mobile data, and OTP delivery.
8. Escalate if the phone still says blocked
   Contact the network and ask whether the SIM must be replaced. If you need to keep the number, ask about the SIM swap route.

What You Should See On-Screen

If the PUK unlock works, you should usually see a prompt to set or confirm a new SIM PIN. After that, the phone should reconnect to the mobile network.

If the unlock does not work, you may see:

• Incorrect PUK;
• PUK blocked;
• PUK exhausted;
• SIM permanently blocked;
• Invalid SIM;
• No Service;
• Emergency Calls Only.

When you see any permanent block or exhausted message, stop entering codes and move to provider support.

What Not to Do

Do not:

• guess the PUK;
• keep retrying after several failures;
• use another SIM’s PUK;
• share your PUK publicly;
• share OTPs with anyone who calls you;
• use your banking PIN as a SIM PIN;
• assume a USSD code is still current without checking the provider;
• ignore sudden signal loss if your number is linked to banking or important accounts.

Related Guides

FAQs

Why is SIM permanently blocked happening?

It usually happens after the wrong SIM PIN and then the wrong PUK were entered too many times. Once the PUK is exhausted, the SIM may need to be replaced by the mobile network. Apple advises users to ask their network provider for a new SIM or eSIM if the SIM cannot be unlocked or the alert says “PUK exhausted.” (Apple Support)

Does this mean the PUK code has changed?

Not necessarily. It may mean the PUK was typed incorrectly, the PUK belongs to another SIM, the SIM has already been replaced, or the PUK attempt limit has been reached. Get the PUK again from your official provider account before retrying.

Can I fix it without calling customer care?

Sometimes, yes, if the phone still asks for PUK and you can retrieve the correct PUK through the provider app, website, IVR, or USSD menu. If the phone says SIM permanently blocked or PUK exhausted, you will usually need provider support, a store visit, replacement SIM, or SIM swap.

Should I use the app instead of USSD?

Yes, use the app or website if the SIM cannot connect to the network. A blocked SIM may not be able to run USSD, but Wi-Fi may still let you access your account through the provider’s app or website.

What should I do if PUK USSD is not working?

Restart the phone once, check signal, and confirm the SIM provider. If USSD still does not open, use Wi-Fi, the provider app, website, WhatsApp support, customer care, or a store. Do not keep entering PUK codes while troubleshooting.

What happens if I entered the wrong PUK too many times?

The SIM may become permanently blocked. Vodacom states that if the PUK is entered incorrectly 10 times, the SIM becomes permanently blocked and the user needs a new SIM plus a SIM swap to keep the number. (Vodacom)

Are there costs, limits, or eligibility rules?

There may be provider-specific rules for replacement SIMs, SIM swaps, RICA checks, eSIM replacement, contract ownership, store verification, and support access. These can change, so confirm them with the provider before acting.

Which related guide should I read next?

Read get PUK number South Africa if you still need the correct PUK. Read how to do SIM swap South Africa if the SIM is already permanently blocked. Use mobile network customer care numbers if you need direct provider support.