Nigerian telecommunication companies have provided guidelines to help subscribers unblock their SIM cards following recent disconnections due to the ongoing National Identification Number (NIN) – SIM harmonisation exercise. This initiative aims to enhance the integrity of the national SIM registration database and has led to temporary service disruptions for many users. Here’s how to restore your connectivity:

1. **Airtel**:
– Dial `*121#` and enter your eleven-digit NIN.
– A confirmation message will indicate that your Airtel SIM card has been successfully unbarred.

2. **9mobile (EMTS)**:
– Dial `*200*8#`.

3. **Glo**:
– Dial `109` followed by your NIN number (e.g., `*109*12345678901#`).
– Follow the prompts to submit your NIN.

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4. **MTN**:
– Visit [nin.mtn.ng](http://nin.mtn.ng) to check your NIN status.
– If not linked, proceed to link it by providing your OTP and NIN.
– Once linked, your line will be automatically unbarred.

5. **Smile**:
– Send your NIN to customercare@smile.com.ng or call `07020444444`.
– After providing consent and verifying your NIN, your line will be unbarred.

6. **Spectranet**:
– Call `8002345678` or email care@spectranet.com.ng to submit your NIN.
– KYC verification at a Spectranet store is required.
– You can also submit your NIN online but must complete KYC at a Spectranet store.

7. **Ntel**:
– Visit any Ntel store with your NIN.
– Your fingerprint will be used to verify your existing KYC profile.
– Upon verification and consent, your line will be updated and unbarred.

By following these steps, you can quickly restore your mobile service and stay connected.