Suspicious Login Issues

How to Stop Repeated Unsolicited SMS Verification Codes

Phi Hung Vo Oct 21, 2026 868 views

Question details

The user is continuously receiving unsolicited SMS verification codes and needs to know if their accounts are compromised and how to address the issue.

How to Stop Repeated Unsolicited SMS Verification Codes

Product: Account Security
Device & OS: not provided
Scenario: The user is repeatedly receiving two-factor authentication (2FA) codes via SMS without attempting to log in anywhere.
Observed behavior: Frequent text messages containing verification codes arrive from various numbers, raising concerns about potential account hacking and prompting the user to block numbers daily.

Before you start

Never share the verification codes you receive, click on any links in the text messages, or reply to the sender, as this confirms your phone number is active to attackers.

Solution 1Recommended

Update Passwords and Enable Strong MFA

Secure the account associated with the SMS messages by changing the password and upgrading your two-factor authentication.

Receiving these codes means someone knows your phone number or email address and is triggering the login process. Securing the core account is the most important step to prevent unauthorized access.

Log in to the affected service

Identify the service generating the codes (e.g., Microsoft, Google, or a specific app) and log in directly through their official website rather than any links provided in messages.

Change your password

Navigate to the account security settings and change your password to a strong, unique combination of letters, numbers, and symbols.

Upgrade your 2FA method

If possible, switch your Two-Factor Authentication (2FA) method from SMS to a more secure authenticator app to prevent SMS-based attacks.

Account Secured: Once your password is changed and an authenticator app is enabled, attackers will no longer be able to trigger SMS codes using your old credentials.

Solution 2

Review Recent Sign-In Activity

Check your account logs to see if there are unauthorized login attempts from unknown locations.

Solution 3

Block the Senders

Reduce notification spam by blocking the specific phone numbers sending the unsolicited codes.

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Frequently Asked Questions

Does receiving an unsolicited SMS code mean my bank account is hacked?

Not necessarily. Receiving a code usually means someone has your phone number or email and is trying to trigger a login or account recovery. However, they cannot access the account without both your password and the code you received. Your account remains secure as long as you do not share the code.

What does 2FA mean in account security?

Two-Factor Authentication (2FA), or Multi-Factor Authentication (MFA), is an extra layer of security. It requires two forms of identification to access an account: something you know (your password) and something you have (a unique code sent via SMS or generated by an authenticator app).

Should I be worried if I receive an SMS code but no email notification?

This can happen if the attacker only knows your phone number, or if the service's default 2FA method is set exclusively to SMS. While it indicates someone is trying to access your account, the lack of an email does not mean your email account has been hacked. You should still update your passwords as a precaution.

Why do the verification codes come from different numbers?

Large companies use third-party messaging services and multiple phone number pools to send verification codes globally. Attackers might also use automated bots that trigger requests from various localized numbers, making it harder to block them all at once.

Microsoft Office Security Issues