Most alerts are precautionary — triggered by a new device or VPN. But a small number are real threats. Here’s how to tell which and what to do.
Most online services track logins by device fingerprint, browser, and approximate IP-based location. Any login that differs from your usual pattern — a new phone, a different browser, a work computer, or even using a VPN that changes your apparent location — can trigger a precautionary alert. The vast majority of suspicious login alerts fall into this category. The alert is the service doing its job, not necessarily evidence of a problem.
If multiple people use the same account — a shared streaming service, a family Google account, a joint email — a login from someone else in the household from their own device appears as an unfamiliar device and location to the service. This is a common source of confusing alerts that aren't security threats. Checking 'Active Sessions' or 'Recent Activity' in the account settings typically shows the device and location clearly enough to identify.
This is the least common but most serious cause. Unauthorized logins typically come from unfamiliar countries or continents, are at unusual hours, or are followed by account changes (password change, recovery email update, suspicious purchases). If the location in the alert is somewhere you've never been, treat it as a real threat and act immediately — change the password and enable 2FA before investigating further.
Open the alert email or notification and look at the details provided: the device type (iPhone, Windows PC, Android), the approximate location (city and country), and the time. Cross-reference these with what you actually did around that time. A login from 'Chicago, Illinois' on an 'iPhone' at 3pm is probably you. A login from 'Lagos, Nigeria' on a 'Windows PC' at 3am is not. Most services also include a 'This was me' / 'This wasn't me' button that lets you confirm or report the activity directly.
Don't wait to investigate further — change the password first. Go to the account's Security settings and change to a strong, unique password that you don't use anywhere else. A strong password is at least 12 characters with a mix of letters, numbers, and symbols, or a random passphrase (e.g., 'correct-horse-battery-staple'). Using a password manager to generate and store unique passwords is the most reliable long-term approach.
Most major services offer a 'Recent Activity,' 'Active Sessions,' or 'Where you're signed in' page in Security settings. Google: myaccount.google.com > Security > Your devices. Apple: appleid.apple.com > Devices. Microsoft: account.microsoft.com > Security > Activity. Review the list, identify any devices you don't recognize, and sign them out. This terminates any active sessions the unauthorized user may have.
Two-factor authentication (2FA) requires a code from your phone in addition to your password. Even if someone obtains your password, they cannot access your account without the second factor. Enable 2FA in the account's Security settings — most major services support both SMS codes and authenticator apps (Google Authenticator, Authy, Microsoft Authenticator). Authenticator apps are more secure than SMS. See our full guide: 'How to Set Up Two-Factor Authentication.'
If you use the same password on multiple accounts, any account where that password was compromised becomes a potential entry point for all the others. Check whether you've used this password elsewhere and change it on each account that shares it. A password manager like Bitwarden (free), 1Password, or Dashlane can audit your stored passwords for reuse and help you replace them with unique ones.
If the alert is for a bank, email, or account tied to financial services, check for any unauthorized changes after securing access: look for new payees, changed contact information, sent emails you didn't write, or purchases you didn't make. Contact the service's support team if you find anything suspicious — most financial institutions have dedicated fraud teams and may be able to reverse unauthorized transactions.
Describe the alert details and which service it was for — our AI can help you work through securing the account step by step.
Our AI can walk you through securing a compromised account, setting up 2FA, and checking for password reuse — specific to the services you use.
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