Does *#21 tell you if your phone has been hacked?

Can *#21# Tell You If Your Phone Has Been Hacked?

There’s a common belief that dialing *#21# on your phone can reveal whether your device has been hacked or tapped. While it won’t expose every kind of spyware or hacking method, this simple code does serve a useful purpose: it shows whether your calls, texts, or data are being forwarded to another number without your knowledge.

When you enter *#21# on most GSM phones (especially Android devices), your phone displays the current status of call forwarding. This includes voice calls, SMS, data, and even fax services. If any of these are redirected—say, to a suspicious number—it could be a red flag. While not definitive proof of hacking, unexpected forwarding might suggest someone has tampered with your settings, possibly to intercept your communications.

If you do discover unauthorized forwarding, you can disable it instantly by dialing ##21#. This resets the call forwarding settings to default, cutting off any hidden diversions. It’s a quick, no-cost fix that takes seconds.

However, it’s important to note that modern phone hacking often involves more sophisticated techniques—like malware, phishing, or cloud breaches—that *#21# won’t detect. This code only checks one specific feature: call and message forwarding. So while it's a handy tool, it shouldn’t be your only line of defense.

For real security, stick to trusted apps, avoid suspicious links, keep your phone updated, and use strong, unique passwords. Think of *#21# as a basic check-up, not a full diagnosis. It won’t catch every threat, but in some cases, it might just uncover something off.