Changing a SIM card or abandoning an unused phone line may seem harmless, but it can expose your personal information and financial accounts.
Many subscribers leave old SIM cards unused, switch networks without transferring their numbers or abandon lines after moving to a new location. However, telecom providers do not keep inactive numbers permanently. After a period of non-use, typically 90 days under regulatory guidelines, operators can recycle and reassign them to new customers.
This creates a security risk if the old number remains linked to your digital accounts. A new owner could receive your One-Time Passwords (OTPs), password reset messages and other private notifications.
Here are six important steps to take before your old phone number goes to someone else.
1. Update your bank details and BVN
Your bank accounts should be your first priority. Many banks use SMS codes and USSD services to approve transfers, reset PINs and confirm online payments.
If someone gets your old SIM card, they may receive messages meant for you. Contact your bank or use its official app to replace the number. Also, ensure your Bank Verification Number (BVN) profile reflects your active number.
2. Remove the old number from two-factor authentication
Check your Google, Facebook, Instagram, WhatsApp and X accounts. If any still use your old number for two-factor authentication, update their security settings.
Replace the number with your current line or an authenticator app. This reduces the risk of someone receiving your login codes and taking control of your accounts.
3. Transfer your WhatsApp account
WhatsApp accounts are linked to phone numbers, so leaving an old number connected can create problems.
Use WhatsApp’s Change Number feature to move your account, groups and profile settings to your new line. The feature also allows you to notify contacts about the change.
4. Disconnect mobile wallets and payment platforms
Update your details on fintech wallets, betting accounts, electricity payment services and cable television platforms.
Remove saved payment cards where necessary, change your registered number and close accounts you no longer use. This helps prevent unauthorised access to your money and payment details.
5. Update shopping and delivery accounts
Check online marketplaces, food delivery services and ride-hailing apps. Replace your old number and remove outdated delivery addresses.
An inactive number left on these platforms could create confusion over orders, delivery codes and saved account credits. Updating your details also helps protect your home address.
6. Inform important contacts
Tell friends, relatives and business associates that your number has changed. Send a message through SMS or email and ask them to remove the old number from their contact lists.
This can prevent strangers who receive the recycled number from impersonating you or requesting money from people who believe they are contacting you.
How to safely leave an old phone line
Before abandoning a number, make a list of every bank, government portal, social media account and digital service linked to it. Update each account and confirm the changes using your new number.
Back up your contacts and chat history if you are changing devices. Remove the SIM card before selling or handing over the phone.
Finally, keep the old SIM active for at least 30 days while completing the transition. This gives you time to identify forgotten accounts and update any service that still sends notifications to the old number.
Taking these precautions before your old phone number is reassigned can help protect your identity, money and private information.
