As many subscribers suffer blocked SIMs by Nigerian telecommunication companies, here’s a guide on how to unblock the SIM cards.

Recall that the disconnections were due to the ongoing National Identification Number (NIN)-SIM enrollment exercise.
To assist affected customers, telecom companies provided a step-by-step guide on Monday to restore connectivity:

Airtel: Dial *121# and enter your eleven-digit NIN. A confirmation message will indicate that your Airtel SIM card has been successfully unbarred.
9mobile (EMTS): Dial *200*8#.
Glo: Dial *109* followed by your NIN number (e.g., 10912345678901#) and follow the prompts to submit your NIN.
MTN: Visit nin.mtn.ng to check your NIN status. If not linked, proceed to link it. An OTP and NIN will be required. Once linked, your line will be automatically unbarred.
Smile: Send your NIN to customercare@smile.com.ng or call 07020444444. After providing consent and verifying your NIN, your line will be unbarred.
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.
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.
It is worth noting that NCC has ordered all telecommunication companies to unbar all affected sims with immediate effect.