SIM and carrier state
SIMGUARD watches Android-reported SIM and carrier state for unexpected changes that deserve verification.
Premium 24/7 SIM & number watch
SIM Swap Protection for Android: Carrier & Number Change Alerts
SIMGUARD watches SIM, carrier, and phone-number risk signals on your Android device. If something changes unexpectedly, you get early-warning context and a clear response path—before a phone-number takeover spreads to connected accounts.
Android only. Alerts support your response; they do not control a carrier or guarantee prevention.
Phone-number takeover
Why an unauthorized SIM change matters
A SIM swap happens when someone gets a carrier to move your phone number to a SIM or eSIM they control. A port-out moves the number to another carrier. Either event can interrupt service on your phone and expose SMS verification or password-recovery flows.
Control of a phone number does not automatically unlock every account, but it can remove an important barrier. The right response is to verify the change with the carrier and secure accounts that depend on that number.
Common warning signs
Sudden loss of cellular service, an unexpected carrier message, a SIM-change notification, or account-recovery alerts you did not request can all justify immediate verification.What SIMGUARD watches
Premium is the continuous guardian layer. It combines SIM and number watch with the rest of SIMGUARD's protection stack; the Free plan does not include 24/7 SIM monitoring.
Early-warning alerts
When relevant signals change, SIMGUARD can alert you with context and practical next steps instead of a vague warning.
Connected risk context
Premium correlates SIM and number signals with account, device, network, and wallet risk layers on the phone.
What to do after an unexpected alert
Move quickly, but verify each step through trusted channels. Do not rely on a phone number that may already be under someone else's control.
- 1
Use a trusted device to contact your mobile carrier and ask whether a SIM replacement or number transfer was requested.
- 2
Secure the primary email account used for password resets, then review banking, exchange, and social accounts.
- 3
Change affected passwords and sign out unfamiliar sessions. Do not reuse the same recovery path across accounts.
- 4
Replace SMS verification with an authenticator app or hardware security key where the service supports it.
- 5
Save carrier case numbers, account alerts, and relevant timestamps in case you need to report fraud.
SIMGUARD Premium
Keep watch when you are not looking
Start a 3-day free trial. The U.S. reference price is $9.99/month or $79.99/year; Google Play shows the live local price and subscription terms.
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SIM Swap Protection FAQ
What is a carrier or SIM change alert?
It is an alert that tells you SIM, eSIM, or carrier-related state changed on your Android device. An unexpected change can be a reason to contact your carrier and secure connected accounts.
Can SIMGUARD prevent every SIM swap or port-out?
No. SIMGUARD provides early-warning signals and response guidance. Your carrier controls the number transfer, so carrier account protections and fast contact with the carrier remain important.
What should I do after an unexpected SIM or carrier alert?
Use a trusted device to contact your carrier, secure your primary email, review banking and exchange accounts, change affected passwords, and replace SMS verification with an authenticator app or security key where possible.
Also explore SIMGUARD's free known-list spyware scan for Android.