Short answer
Pressing *#21# displays whether call forwarding is active on your phone. It only checks your current settings and does not reveal hacking or activate any features.
Key points
- The code *#21# checks if call forwarding is turned on.
- It does not detect if your phone is hacked.
- It only retrieves information, does not change settings.
- The result depends on your own call forwarding setup.
- This USSD code is safe and built into mobile networks.
Dialing *#21# on your phone checks the status of unconditional call forwarding. You'll see a message confirming whether calls are currently being forwarded or not, based on your own settings.
What *#21# actually does
This code is a USSD command supported by most mobile networks. It asks your carrier: 'Is call forwarding enabled?' The response reflects only settings you or your carrier have applied. It does not detect unauthorized access or spying.
Common myths and misunderstandings
Some online claims suggest *#21# reveals if your phone has been hacked. That’s false. While *21*number# can activate forwarding, *#21# only checks it. The code cannot expose malicious activity or hidden call diversions. It’s a diagnostic tool, not a security scanner. These codes have been part of mobile networks for decades and are used for quick access to services like voicemail or balance checks.
Frequently asked questions
Can *#21# tell if someone is spying on my calls?
No, it only shows if call forwarding is enabled. It cannot detect hacking, eavesdropping, or unauthorized access to your phone.
Is it safe to dial *#21#?
Yes, it’s completely safe. The code only retrieves information and does not change any settings or affect your phone’s security.
What does it mean if call forwarding is on?
It means your calls are being redirected to another number. This could be set by you or your carrier for services like voicemail or call transfer.
Do all phones support *#21#?
Most phones on GSM networks support it, but availability depends on your carrier. Some carriers may not support certain USSD codes.
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