Last checked: 26 June 2026.
A SIM swap lets you replace a lost, stolen, damaged, blocked, or wrong-size SIM while keeping your existing cellphone number. In South Africa, there is no single SIM swap USSD code that works for every network. The right route depends on your provider, whether you still have the old SIM, whether the number is prepaid or contract, and whether the SIM was lost or stolen.
The safest next step is to use your network’s official SIM swap route, prepare your ID and RICA details, and avoid anyone who offers to “push through” a SIM swap outside the official provider process. A SIM swap gives control of your number to a new SIM, so it must be treated as a security-sensitive account change.
Quick Support Route
| Network or situation | What to do first | Where to go next |
|---|---|---|
| Vodacom SIM swap | Vodacom’s official support route says customers can use the Vodacom SIM swap process, and prepaid guidance includes buying a new starter pack, RICA-registering it, and using the new SIM to start the swap route. Vodacom also warns that if you did not request a SIM swap, you have a short window to cancel the request by contacting Vodacom. (Vodacom) | Read Vodacom SIM swap. |
| MTN SIM swap | MTN’s official help pages list SIM swap through MTN self-service. MTN’s SIM swap help says to use *135#, while another MTN help result says prepaid users can dial *135*3# on the new SIM after buying and activating it. MTN’s USSD directory also lists *126*7927# for swapping an old SIM card for a new SIM card, so follow the latest MTN prompt shown on your phone or use MTN support if the menu differs. (MTN South Africa) | Read MTN replace SIM. |
| Cell C SIM swap | Cell C says users with a lost, stolen, or damaged SIM can buy a new Cell C starter pack and use the self-service IVR by dialling 084135 from a landline or another cellphone, visit a Cell C store, or call 084135 / 135 option 9 to speak to an agent. Cell C also says to wait at least 2 hours before inserting the new SIM. (Cell C) | Read Cell C SIM swap. |
| Telkom SIM swap | Telkom says SIM swaps can be done through its WhatsApp self-service channel at no cost by sending a WhatsApp to 081 160 1700 and following the prompts. Telkom also says SIM swaps in stores are charged for. (Telkom) | Read Telkom SIM swap. |
| Lost or stolen SIM | Block the old SIM first so nobody else can use your number, airtime, OTPs, or linked accounts. | Start with block lost SIM South Africa. |
| Suspicious SIM swap message | Do not ignore it. ICASA says signal loss can indicate SIM swap or number-porting fraud, and users should contact their service provider immediately if they lose signal permanently. (ICASA) | Read SIM swap fraud South Africa. |
| SIM active but no signal | Check the activation window, phone settings, network mode, and whether the old SIM has already been disconnected. | Use no signal after SIM swap. |
A SIM swap is not the same as getting a new number. With a SIM swap, your old number is moved to a replacement SIM. With a new SIM activation, you normally receive a new number unless you port or transfer your existing number through the correct provider process.
What You Need Before You Start
Before you start a SIM swap, confirm that you actually need one. You normally need a SIM swap when your SIM is lost, stolen, damaged, blocked, too large or too small for your new phone, or no longer connects after basic troubleshooting.
You usually do not need a SIM swap if you only want a new cellphone number. In that case, you need a new SIM activation and RICA registration rather than a number replacement process.
Have these ready before starting:
| Requirement | Why it matters |
|---|---|
| Replacement SIM from the same provider | Your network must move your current number to the new SIM. |
| Your current cellphone number | The provider needs to identify the number being swapped. |
| ID document, ID card, or passport | SIM swaps and RICA processes normally require identity checks. |
| Proof of residence or address information | MTN says RICA reconnection requires an ID and proof of residence, and RICA-registered SIMs are required to access network services. (MTN South Africa) |
| The old SIM, if you still have it | It may help with verification, but lost-SIM routes exist. |
| Recent account or usage details | Some providers ask security questions before allowing the swap. MTN’s SIM swap guidance says users must answer security questions to continue. (MTN South Africa) |
| Access to official customer care | You may need direct support if the code fails, the SIM was stolen, or fraud is suspected. |
Check network/account status
Before retrying a SIM swap code, check these basics:
- The replacement SIM is from the same network as your old number.
- The replacement SIM has been RICA-registered or activated where required.
- The phone is not locked to another provider.
- You are using the new SIM for routes that require the new replacement SIM.
- You are not confusing SIM swap with number porting.
- The number has not expired, been suspended, or been recycled.
- You have waited for the provider’s stated activation window.
If the SIM swap has been completed but your phone still has no signal, use no signal after SIM swap before trying multiple new swaps.
RICA new SIM vs SIM swap
RICA and SIM swap are connected, but they are not the same task.
RICA is the registration process that links a SIM card to verified customer details. A SIM swap is the process of moving your existing cellphone number to a replacement SIM. MTN explains that unregistered SIMs cannot make or receive calls or access network services, and reconnection requires registration with identity and residence details. (MTN South Africa)
Use check RICA status USSD if the SIM is not activating and you are unsure whether registration is the problem.
Retry safely
If the SIM swap code or menu does not work:
- Stop and check that the route belongs to your provider.
- Restart the phone and try again once.
- Confirm the replacement SIM is inserted correctly.
- Try the provider’s broader self-service menu.
- Do not share OTPs, banking messages, ID photos, or SIM serial numbers with strangers online.
- Use the provider-specific guide linked below.
- Contact the network if the SIM was lost, stolen, blocked, or rejected during verification.
For broader network menus, use mobile self-service codes South Africa.
Provider-by-Provider Options
Vodacom SIM swap
Use the Vodacom route if your number is on Vodacom and you need to replace the SIM while keeping your old number.
Vodacom’s official help and self-service pages show that SIM swaps are handled through Vodacom support and self-service routes. Vodacom prepaid guidance includes buying a new prepaid starter pack, registering it for RICA, dialling from the new SIM, choosing the option to use the old number, and completing the process through Vodacom’s support route. (Vodacom)
Use Vodacom SIM swap if:
- your Vodacom SIM is lost, stolen, damaged, or blocked;
- your phone was stolen and the old SIM must be secured;
- you need to keep your existing Vodacom number;
- you are unsure whether to use USSD, customer care, TOBi, or a store.
If you receive a Vodacom SIM swap message that you did not request, contact Vodacom immediately. Vodacom’s help result says users have up to 2 hours from receiving the SMS to cancel an unauthorised request by calling the provider’s support route. (Vodacom)
MTN SIM swap
Use the MTN route if your number is on MTN and you need a replacement SIM.
MTN’s official pages show more than one SIM swap entry point. One MTN SIM swap help page says to dial *135#, another MTN help result says prepaid users can buy and activate a new SIM and then dial *135*3# on the new SIM, and MTN’s USSD directory lists *126*7927# for swapping an old SIM card for a new SIM card. (MTN South Africa)
Because MTN’s own pages show multiple routes, the safest instruction is to start with MTN’s current self-service menu on your phone and follow the SIM swap prompt that appears. If the menu does not match the guide, contact MTN or visit an MTN store.
Use MTN replace SIM if:
- your MTN SIM is lost, stolen, damaged, or blocked;
- you bought a replacement MTN SIM;
- you need to keep your existing MTN number;
- the MTN USSD menu does not show the expected SIM swap option.
Cell C SIM swap
Use the Cell C route if your number is on Cell C and your SIM was lost, stolen, or damaged.
Cell C says users can buy a new Cell C starter pack and then use one of these routes: dial 084135 from a landline or another cellphone and use the Self-Service IVR, go to a Cell C store, or dial 084135 / 135 option 9 to speak to an agent. Cell C also says users should wait at least 2 hours before inserting the new SIM card into the cellphone. (Cell C)
Use Cell C SIM swap if:
- your Cell C SIM was lost, stolen, or damaged;
- you cannot access the old SIM;
- you need help from the Cell C IVR or an agent;
- the replacement SIM does not activate after the waiting period.
Telkom SIM swap
Use the Telkom route if your number is on Telkom Mobile and you need to replace the SIM.
Telkom says SIM swaps can be completed through its WhatsApp self-service channel at no cost by sending a WhatsApp to 081 160 1700 and following the prompts. Telkom also states that SIM swaps in Telkom stores are charged for. (Telkom)
Use Telkom SIM swap if:
- your Telkom SIM is lost, stolen, damaged, or blocked;
- you have access to WhatsApp through Wi-Fi or another SIM;
- you need to keep your existing Telkom number;
- you want to compare the WhatsApp route with the store route.
When You Must Contact Customer Care
Contact your provider directly instead of repeatedly trying codes if the issue involves security, identity verification, fraud, or a lost device.
| Situation | Why customer care is required |
|---|---|
| Your SIM or phone was stolen | The old SIM may need to be blocked before the number is moved. Use block lost SIM South Africa. |
| You received a SIM swap message you did not request | This may be SIM-swap fraud. Contact the network immediately and read SIM swap fraud South Africa. |
| Your phone suddenly lost signal | ICASA says signal loss may indicate SIM swap or number-porting fraud, and permanent signal loss should be reported to the service provider immediately. (ICASA) |
| The SIM swap menu rejects your answers | The provider may need to verify that you are the legitimate number holder. |
| Your number is linked to banking OTPs | Secure your bank account, email, WhatsApp, and online accounts before continuing. |
| You are on contract, business, eSIM, or someone else’s account | Store or account-holder verification may be needed. |
| Your replacement SIM has no signal after the swap | Use no signal after SIM swap and then contact the provider if it continues. |
| You suspect illegal porting | ICASA warns that illegal number porting can be used to take control of a user’s mobile number. (ICASA) |
Official support route
Use only official provider support routes. Do not complete a SIM swap through a social media inbox, street seller, unofficial WhatsApp contact, or anyone asking for banking OTPs.
Use mobile network customer care numbers if:
- the provider’s SIM swap menu is not working;
- your SIM was stolen;
- your number is blocked;
- you received a SIM swap message you did not request;
- your number has no signal after the swap;
- you need to confirm the latest fee, waiting period, or verification rule.
Escalation route
If you think someone is trying to take over your number:
- Contact your network immediately.
- Ask whether a SIM swap or number port has been requested.
- Ask the provider to block unauthorised changes.
- Contact your bank if the number receives OTPs.
- Change passwords for your email, bank profile, WhatsApp, and important apps.
- Do not approve OTPs or login prompts.
- Keep screenshots of suspicious messages.
- Read SIM swap fraud South Africa.
ICASA says SIM-swap fraud often starts with criminals using SMS, email, or phone calls to gain access to personal information. ICASA also warns users not to respond to requests for personal or confidential information and not to buy SIM cards from street vendors. (ICASA)
Related SIM, PUK, and Account Guides
Use these related guides for the next step:
- Vodacom SIM swap — Vodacom-specific replacement SIM guidance.
- MTN replace SIM — MTN-specific SIM swap route and troubleshooting.
- Cell C SIM swap — Cell C lost, stolen, or damaged SIM support.
- Telkom SIM swap — Telkom WhatsApp and store SIM swap options.
- block lost SIM South Africa — what to do before replacing a stolen or missing SIM.
- SIM swap fraud South Africa — warning signs and urgent steps.
- SIM card security — protecting your SIM, OTPs, and accounts.
- check RICA status USSD — checking whether SIM registration is the issue.
- SIM swap not working — failed swap, rejected menu, or activation problems.
- no signal after SIM swap — checks when the new SIM does not connect.
- mobile network customer care numbers — direct support routes for South African networks.
- mobile self-service codes South Africa — broader USSD and self-service menus.
FAQs
What is how to do SIM swap South Africa used for?
It is used when you need to replace a SIM card but keep your existing South African cellphone number. This is common when a SIM is lost, stolen, damaged, blocked, or no longer fits your phone. Start with the provider-specific guide for your network: Vodacom SIM swap, MTN replace SIM, Cell C SIM swap, or Telkom SIM swap.
What is the SIM swap USSD code in South Africa?
There is no single SIM swap USSD code for all South African networks. Vodacom, MTN, Cell C, and Telkom use different routes. MTN’s own official pages show more than one SIM swap entry point, while Telkom lists WhatsApp self-service rather than a SIM swap USSD code. (MTN South Africa)
Does a SIM swap USSD code need airtime or data?
USSD does not use mobile data, but your phone must still be able to connect to the mobile network and open the provider’s menu. If the provider uses WhatsApp, app, call centre, or store verification instead of USSD, you may need data, Wi-Fi, airtime, or in-person support depending on the route.
What should I do if the SIM swap code does not work?
Check that you are using the correct provider’s code, insert the replacement SIM, restart your phone, and try the official self-service menu once more. If it still fails, contact the network directly or use SIM swap not working. Do not keep trying random codes from old forum posts.
Can I do a SIM swap if I lost my old SIM?
Yes, but the process may require stronger verification. Cell C, for example, gives options for lost, stolen, or damaged SIMs through its IVR, stores, or agent route. (Cell C) If the SIM was stolen, start with block lost SIM South Africa before trying to replace it.
Is SIM swap the same as RICA?
No. RICA is SIM registration. SIM swap is moving an existing number to a replacement SIM. You may need RICA documents for the replacement SIM, but the purpose of the SIM swap is to keep your old number.
What documents do I need for a SIM swap?
You may need your ID, proof of residence, replacement SIM, current cellphone number, and answers to security questions. MTN’s RICA information says users need an ID, proof of residence, and the SIM card being registered when reconnecting or registering. (MTN South Africa) Provider requirements can change, so check your network’s latest support route before visiting a store.
What if I receive a SIM swap message I did not request?
Contact your network immediately. ICASA says users should watch for signal loss, avoid sharing personal or confidential information, and report unexpected porting or SIM-swap claims to their service provider. (ICASA) Also secure your bank, email, WhatsApp, and important online accounts.
Will I keep my old number after a SIM swap?
Yes, keeping your old number is the purpose of a SIM swap. If you activate a normal new SIM without doing a SIM swap or number transfer, you may receive a new number instead.
Where can I find related USSD codes?
Use mobile self-service codes South Africa for broader network menus. Use mobile network customer care numbers if the SIM swap cannot be completed through self-service.