Quick answer: A SIM PIN is a security code that locks your SIM card or eSIM. When SIM PIN lock is switched on, your phone may ask for that PIN before the SIM can be used for calls, SMS, or mobile data. It is different from your phone screen-lock PIN, password, pattern, fingerprint, or Face ID. Apple’s support guidance explains that a SIM PIN locks the SIM or eSIM so an identification code is required for phone calls and mobile data. (Apple Support)
Last checked: 26 June 2026
Do not guess a SIM PIN. If you enter the wrong SIM PIN too many times, the SIM can lock and ask for a PUK code. Apple warns that guessing the wrong SIM PIN or PUK can permanently lock the SIM or eSIM, and MTN South Africa says a SIM card automatically locks if the wrong PIN is entered three times. (Apple Support)
Quick Support Route
Use this guide if your phone asks for a SIM PIN code, if you want to know what is a SIM PIN, or if you need to decide whether to change the SIM PIN, get a PUK code, or contact your network.
| Your situation | What it means | Safe next step |
|---|---|---|
| Your phone asks for a SIM PIN after restart | SIM lock may be switched on | Enter the SIM PIN only if you know it. |
| You know the current SIM PIN | You may be able to change it in phone settings | Use your phone’s SIM lock settings. |
| You do not know the SIM PIN | You need help from the network that issued the SIM | Do not guess; contact the provider or check official support. |
| Your SIM asks for a PUK | The SIM PIN was likely entered incorrectly too many times | Read get PUK number South Africa. |
| Your SIM says PUK exhausted or permanently blocked | The SIM may need replacement | Contact your network directly. |
There is no single verified South African USSD code that changes every SIM PIN across all networks. SIM PIN settings are usually handled on the phone itself. Provider USSD menus, apps, and support routes are mainly used when you need account help, PUK retrieval, SIM swap help, or self-service support.
SIM PIN vs Phone PIN
A SIM PIN protects the SIM card or eSIM. It helps stop someone from taking your SIM, putting it into another phone, and using it for network services if the SIM lock is active.
A phone PIN protects the device screen. It stops someone from opening the phone, apps, files, photos, and messages.
These two PINs can be different. Changing your phone screen-lock PIN does not automatically change your SIM PIN. Changing your SIM PIN does not automatically change your phone screen-lock PIN.
What You Need Before You Start
Before you try to change, unlock, or troubleshoot a SIM PIN, confirm these details.
Check the exact message on the phone
Look carefully at the wording. A phone may ask for:
- SIM PIN
- SIM locked
- PUK
- Network unlock code
- Phone PIN
- Device password
These are not all the same. A SIM PIN or PUK issue belongs to your mobile network and SIM. A phone PIN or device password issue belongs to the phone’s lock screen.
Confirm your network provider
Check whether the SIM is on Vodacom, MTN, Cell C, Telkom, or another provider. If you are not sure, check the SIM card, SIM pack, phone network name, mobile app, online account, or billing profile.
Apple’s guidance says that if you are not sure which carrier to contact, you can check the carrier name or logo on the physical SIM, or check the eSIM carrier inside mobile service settings. (Apple Support)
Know whether you have the current SIM PIN
To change a SIM PIN, the phone normally asks for the current SIM PIN first. Samsung’s support guidance shows the SIM card lock menu where users can lock the SIM and then change the SIM card PIN, but the menu path can differ by model. (Samsung pl)
Stop if the SIM is already blocked
If the SIM PIN has already been entered incorrectly too many times, the phone may ask for a PUK. In that case, changing the SIM PIN in settings will not solve the problem. You need the PUK from the network provider.
Have ownership details ready
Customer care may need to verify that the number belongs to you before giving account help, PUK help, or SIM replacement support. Have your cellphone number, ID details, SIM pack, account login, or RICA-related details ready if the provider asks for them.
How To Change SIM PIN
Only change the SIM PIN if you know the current SIM PIN. Do not guess.
iPhone
On iPhone, go to Settings → Cellular or Mobile Service → choose the relevant SIM or number if needed → SIM PIN. Apple says users should contact their network provider for help with the default SIM PIN or PUK if they do not know the code. (Apple Support)
Samsung
On Samsung phones, the SIM lock setting is usually under security settings. Samsung lists an example route of Settings→ Lock screen and security → Other security settings → Set up SIM card lock, but also notes that the navigation path may differ by model. (Samsung pl)
Other Android phones
On many Android phones, SIM PIN settings are under Security, Privacy, More security settings, or SIM card lock. The wording depends on the phone brand and Android version. If you cannot find the setting, search your phone settings for “SIM lock” or “SIM PIN”.
Provider-by-Provider Options
The table below gives the safest support direction. It does not claim a universal SIM PIN code, because SIM PIN changes are usually handled on the handset, while PUK and account support routes are provider-specific.
| Provider | SIM PIN support path | PUK or blocked SIM support path |
|---|---|---|
| Vodacom | Use phone SIM lock settings if you know the current SIM PIN. If you do not know it, do not guess. | Vodacom says a PUK is needed when the wrong PIN is entered three times. Vodacom also says users can view a PUK in the My Vodacom app. (help.vodacom.co.za) |
| MTN | Use phone SIM lock settings if you know the current SIM PIN. If the SIM is blocked, move to PUK help. | MTN says a SIM automatically locks if the wrong PIN is entered three times and can be unlocked with the PUK. MTN also lists an unblock route that requires the PUK and a new PIN. (MTN) |
| Cell C | Do not confuse a SIM PIN with a Cell C self-service PIN. Use phone settings for SIM lock if you know the current SIM PIN. | Cell C lists PUK retrieval options through the Cell C app, website self-service, IVR, USSD *147#, and customer care. (Cell C) |
| Telkom | Use phone SIM lock settings if you know the current SIM PIN. Use Telkom support if you do not know it. | Telkom lists self-service support through *180#, the MyTelkom app, WhatsApp support, and online help routes. Check the current Telkom support route before entering any code. (Telkom) |
For stronger SIM protection, read how to secure SIM card. For broader account menus, read mobile self-service codes South Africa.
When You Must Contact Customer Care
Contact your network directly if:
- You do not know the SIM PIN.
- The phone asks for a PUK.
- The SIM says PUK exhausted, SIM blocked, or SIM permanently blocked.
- You entered the wrong SIM PIN three times.
- You entered the wrong PUK and are not sure how many attempts remain.
- The SIM was lost or stolen.
- Your phone suddenly lost signal and you suspect an unauthorised SIM swap.
- You cannot access the provider app, USSD menu, or self-service portal.
- The SIM belongs to a contract, company, family account, or someone else’s account.
- Customer care needs to verify ownership before helping.
MTN states that if a PUK is entered incorrectly more than nine times, the SIM card may be destroyed due to incorrect PUK entry. Apple also warns that if the SIM or eSIM cannot be unlocked with the SIM PIN or PUK, or if the phone says “PUK exhausted”, users should ask for a new SIM card or eSIM. (MTN)
Retry Safely
If the SIM PIN does not work, follow this safer order:
- Stop entering numbers if you are not sure.
- Confirm whether the phone asks for SIM PIN, PUK, phone PIN, or network unlock code.
- Check your SIM pack if you still have it.
- Check your provider app or online account.
- Use the provider’s official support route.
- If the phone asks for a PUK, go to get PUK number South Africa.
- If the SIM is lost, stolen, or suspected of being swapped, secure the account before trying again.
Official Support Route
Use official provider support when the code is unknown, the SIM is blocked, or ownership must be verified. Avoid social media comments, third-party code lists, or old screenshots when dealing with SIM PIN, PUK, SIM swap, or account security.
A safe support route is:
- Open your provider’s official app or website.
- Search for PUK, SIM PIN, SIM lock, or blocked SIM.
- Use the official customer-care number or verified chat channel.
- Prepare your ID, number, account details, or SIM pack details if asked.
- Do not share OTPs, banking passwords, or full account passwords with anyone who contacts you unexpectedly.
Related SIM, PUK, and Account Guides
Read these next if your issue is related but not exactly the same:
- get PUK number South Africa — use this if your SIM is blocked or your phone asks for a PUK.
- how to secure SIM card — use this if you want to reduce SIM misuse, SIM swap risk, and unauthorised use.
- mobile self-service codes South Africa — use this for general account, recharge, balance, bundle, and self-service menus.
FAQs
What is a SIM PIN used for?
A SIM PIN is used to lock your SIM card or eSIM so that a code may be required before the SIM can be used for mobile services such as calls and mobile data. Apple describes it as a way to lock your SIM or eSIM with an identification code. (Apple Support)
Is a SIM PIN the same as a phone PIN?
No. A SIM PIN protects the SIM card or eSIM. A phone PIN protects access to the phone screen and device content. You may know your phone PIN and still not know your SIM PIN.
What is the code for what is a SIM PIN?
There is no single verified South African USSD code for “what is a SIM PIN”. SIM PIN changes are usually handled in phone settings. Provider codes and menus are mainly used for account support, PUK retrieval, SIM swap help, or self-service.
How do I change SIM PIN?
Use the SIM lock settings on your phone. On iPhone, check Settings → Cellular or Mobile Service → SIM PIN. On Samsung, check the SIM card lock menu under security settings, noting that the exact path may differ by model. (Apple Support)
Does this USSD code need airtime or data?
Changing a known SIM PIN in phone settings normally does not need mobile data. However, provider support routes may differ. If you need a PUK through an app, website, WhatsApp, customer care, or self-service channel, you may need Wi-Fi, airtime, another phone, or account access depending on the provider route.
What should I do if the SIM PIN does not work?
Stop trying random numbers. Confirm whether the phone asks for a SIM PIN or a PUK. If it asks for a PUK, use get PUK number South Africa or contact your network directly.
What happens if I enter the wrong SIM PIN three times?
The SIM may lock and ask for a PUK. MTN says a SIM card automatically locks if the wrong PIN is entered three times. Vodacom also states that this happens when the wrong PIN is entered three times. (MTN)
What happens if I enter the wrong PUK too many times?
The SIM can become unusable and may need replacement. MTN’s terms say a SIM may be destroyed if the PUK is entered incorrectly more than nine times, and Apple warns that wrong SIM PIN or PUK guesses can permanently lock the SIM or eSIM. (MTN)
Where can I find related USSD codes?
For broader mobile menus, read mobile self-service codes South Africa. For blocked SIM and PUK help, read get PUK number South Africa. For SIM safety, read how to secure SIM card.
Which related guide should users read next?
If your phone asks for a PUK, read get PUK number South Africa. If you want to reduce SIM misuse or SIM swap risk, read how to secure SIM card.