How to Link Your NIN to Your Phone SIM in Nigeria

Nigerian law requires every SIM to be linked to a valid National Identification Number. Here is how to link yours safely using official network and NIMC channels.

Step by step

1. Have your NIN readyGet your 11-digit National Identification Number. If you do not know it, you can retrieve it through NIMC official channels or the NIMC MobileID app.
2. Use the line you want to linkInsert and use the specific SIM you are linking, because the USSD request is read from the number you dial from.
3. Dial the universal codeDial *996# and follow the on-screen menu to submit your NIN for linking. This code is endorsed across networks by the regulator.
4. Or use your network own channelAlternatively open your network official app or website, or visit a service centre, and choose the NIN linking or update option.
5. Enter and confirm your NINType your 11-digit NIN exactly when prompted and confirm. Do not add spaces or extra digits.
6. Wait for confirmationYou should receive a confirmation message. Linking can be immediate or take some hours to reflect on the network.
7. Verify the linkDial *996# again, or check your NIMC MobileID app, to confirm the SIM now shows as linked to your NIN.

Linking your National Identification Number (NIN) to your phone SIM is now a legal requirement in Nigeria, and lines that remain unlinked can be restricted or barred entirely from calls, texts and data. The process is free through official channels and usually takes only a few minutes, but the surrounding confusion over which code to dial, and conflicting instructions online, is exactly what scammers exploit. Doing it yourself, through verified channels, keeps both your line and your identity safe.

What NIN-SIM linking is

The NIN is the unique 11-digit number issued by the National Identity Management Commission (NIMC) to every enrolled person. Linking connects that number to the mobile lines registered in your name, so your SIM is tied to a verified identity. The policy, overseen by the Nigerian Communications Commission (NCC) and NIMC, is meant to improve security and reduce the misuse of anonymous SIMs. Once your SIM is linked, it stays active; if it is not linked, your network is obliged to restrict it, which is why periodic enforcement deadlines prompt a rush of people trying to link at once. The requirement applies to every active line, including data-only SIMs and lines you rarely use, so it is worth accounting for all of them rather than just your main number. Linking is also a one-time action per line in most cases, meaning once a SIM is correctly tied to your NIN you should not need to repeat it unless something changes. Understanding this helps you ignore the false messages that claim you must re-link urgently or lose your number, which are a favourite tactic of fraudsters.

Who needs to link and who is eligible

Every subscriber with a Nigerian SIM needs a linked NIN, whether the line is new or years old. You are eligible to link once you have been enrolled for a NIN and have your 11-digit number. If you have not yet enrolled, you must first register with NIMC to obtain a NIN before any linking is possible. People who manage lines for family members, such as children or elderly relatives, should ensure each line is linked to the correct person NIN rather than lumping several lines under one identity, which can cause problems later.

Documents and details required

The core requirement is your 11-digit NIN and the SIM you want to link. For USSD linking, simply use the phone holding that SIM, since the request reads the number you dial from. If you link at a service centre, bring your NIN slip or a NIMC-issued identity document. If you do not know your NIN, you can retrieve it through NIMC official channels or the NIMC MobileID app rather than guessing, since entering a wrong number will either fail or, worse, link your SIM to another person identity. Keeping your NIN stored securely means you are never tempted to rely on a stranger to look it up.

Fees and payment

Linking your NIN to your SIM through the official USSD code, app, website or service centre is not a paid service in itself. You should be wary of anyone presenting linking as a service that requires a fee paid to them. A modest charge may apply only to certain optional assistance or retrieval services, and in those cases the network states the cost openly before you proceed. No official channel asks you to pay a stranger to keep your line from being barred, and no genuine agent needs your banking details to complete a link.

Realistic timeline

Submitting your NIN by USSD or app takes just a few minutes. The confirmation that your line is linked may be immediate or may take a few hours to reflect across the network systems. If you link close to an enforcement deadline, allow time for processing rather than assuming it is instant, and keep the confirmation message as evidence. Checking again after a short wait confirms the link has registered, and gives you peace of mind that your line will not be suddenly restricted.

Network and channel variation

While the *996# code is endorsed to work across networks for linking and checking, each operator, MTN, Airtel, Glo and 9mobile, also publishes its own network-specific USSD codes, apps and web portals. Reported network codes sometimes conflict between third-party guides, which is why you should confirm the exact code on your operator official website, app or customer care line rather than trusting a forwarded message. The universal *996# code is the safest starting point when you are unsure, and if it does not work you can fall back on your operator official app or a service centre.

Common problems and how to fix them

Linking can fail if you mistype your NIN, add spaces, or dial from a different line than the one you intend to link. Recheck the 11 digits and dial from the correct SIM. If the USSD menu errors repeatedly, the network may be congested; try again later or use your network app or a service centre instead. If a line you believe is linked still shows restricted, verify the status with *996# or the NIMC app, and visit a service centre if the mismatch persists, taking your NIN document with you so staff can resolve it on the spot.

What to do if the channel is unavailable

If the USSD code or app is temporarily down, wait and try again rather than responding to any message offering an alternative shortcut. You can always complete linking in person at your network official service centre, where staff verify your identity directly and can confirm the link immediately. Avoid roadside agents who ask for your NIN and a fee, since handing your NIN to an untrusted person exposes you to identity misuse, including the risk of your identity being linked to SIMs you never owned.

How to verify the process is genuine

Genuine linking is something you initiate yourself: you dial the official code, open the official app, or walk into an official service centre. NIMC and the networks do not call, text or message you demanding your NIN, your NIMC password, an OTP or bank details, and they never threaten instant disconnection unless you reveal such information to a caller. Any such contact is a scam designed to harvest your identity. Verify codes and steps only on ncc.gov.ng, nimc.gov.ng or your operator official site.

Practical tips

Memorise or securely store your NIN so you are not forced to retrieve it under pressure. Link each of your lines and then use the NIMC MobileID app to see every number tied to your NIN, which also helps you spot any line registered without your knowledge so you can report it. Keep your confirmation message. Never read your NIN aloud to an unexpected caller, however official they sound, and never type it into a link sent to you by text or social media. If you share a phone with family members, make sure each person line is linked to their own identity rather than yours, so responsibility is clear if a line is ever misused. When a deadline is announced, link early rather than waiting for the final days, when service centres are crowded and USSD menus are slow. And if you are ever unsure whether a request is genuine, stop, and complete the task yourself through the universal code or a service centre.

SabiGuide is an independent guide and is not affiliated with any government agency. Fees, links and steps can change — always confirm on the official portal before you act. This is general information, not legal or financial advice.