How to Block MTN SIM Card in Nigeria (2025 Guide)

Learn how to block your MTN SIM card in Nigeria in 2025 due to loss, theft, or fraud. Discover USSD codes, customer care options, and online alternatives.

Losing your phone or SIM card can be stressful, especially if it falls into the wrong hands. In 2025, MTN Nigeria has made it easier than ever to block your SIM card and protect your line from unauthorized use. Whether your phone was stolen, misplaced, or compromised, here’s a simple guide on how to block your MTN SIM card quickly.

How to Block MTN SIM Card Using MTN Customer Care

If your SIM card is stolen or lost, your first step should be to contact MTN’s 24/7 customer service:

MTN Customer Care Number (Nigeria):
Dial 180 from any MTN line or 08031000180 from another network or when using a landline.
Ask the agent to block your SIM. Be ready to provide personal verification details such as:
- Your full name
- Last recharge amount
- Frequently dialed numbers
- SIM card serial number (if available)

How to Block MTN SIM via MTN Service Center

Visit any MTN Experience Center near you with a valid means of identification (e.g., NIN, driver’s license, or international passport). Ask for immediate SIM block or replacement.

👉 Find the nearest MTN store here

Block MTN SIM with NIN Portal (New Option – 2025)

As part of the Nigerian government’s SIM-NIN integration policy, MTN now supports reporting lost or stolen lines via the NIMC portal:

Visit: https://nimc.gov.ng
Navigate to “SIM Management”
Select “Report SIM Loss”
Fill in the details and your SIM will be suspended while being investigated

Can You Block MTN SIM Using USSD?

No, currently in 2025, MTN does not allow SIM blocking through USSD codes due to security concerns. You must contact support or visit a service center.

Preventive Tip: Use MTN Backup & SIM Lock

MTN Backup: Always back up your contacts with MTN Backup service.
SIM Lock: Set a SIM PIN on your phone via:
- Android: Settings > Security > SIM Card Lock
- iPhone: Settings > Mobile Data > SIM PIN

Blocking your MTN SIM card in Nigeria has become easier and more secure in 2025. Whether you choose to call customer care, visit an MTN center, or report it online, taking quick action will help you avoid unauthorized charges and fraud. Don’t forget to get a replacement SIM once it’s blocked.

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