What Does Dialing *#21# On iPhone Do?

There is a message going round about how the *#21# code is used to find out if someone is monitoring your cell phone. The claim is that when you type *#21# on your iPhone, if it displays that a list of features are enabled, that is proof that your phone has been tapped.

In some of these messages, users are told to discard their phones after this test returns positive. But is this claim true? I have been a mobile technology person since 2001 and I can tell you for certain that the claim is a hoax. Dialing *#21# on your iPhone does not tell you whether your phone has been tapped or not.

*#21# or ##21# code meaning

What the *#21# code does on your iPhone

The question on your mind now must be, “What does the *#21# code do on my iPhone?” That specific code tells you if you have call forwarding enabled on your line. That is it. Call forwarding is a standard cell phone technology that diverts your calls to another number when your phone number is unreachable or unavailable.

For example, one popular use of call forwarding is to divert work calls to another number while you are on vacation, so another member of the team can attend to customers and service providers who need to reach the business. Call forwarding is a useful business feature.

As already mentioned, entering *#21# only shows which call forwarding types are active on your line. It does not reveal whether or not your cellular or mobile number or iPhone has been tapped.

When I dialed *#21# on my iPhone

As a way of demonstrating this, I entered the USSD code on my iPhone and the got the following results listed on the screen:

  • Setting Interrogation Succeeded: Voice Call Forwarding On All Calls Disabled
  • Setting Interrogation Succeeded: Data Call Forwarding On All Calls Disabled
  • Setting Interrogation Succeeded: Fax Call Forwarding On All Calls Disabled
  • Setting Interrogation Succeeded: SMS Call Forwarding On All Calls Disabled

The above results tell me that my voice calls, data calls, fax calls, and SMS text messages are not being forwarded. All my calls come directly to my line. Here is the screenshot:

*#21# setting interrogation results for iPhone

How to disable call forwarding on your iPhone

If you dial *#21# and find that call forwarding is enabled in some way, there is no need to fret or worry. Most likely, you turned it on inadvertently. All you have to do is turn it off now, should you not need it. You can disable call forwarding by dialling ##21# or ##002# on your phone. Please do not dispose of your iPhone because a hoax says to.

Key takeaways from this article

Here are the key things you should remember from this article:

  • Dialing *#21# on your iPhone does not reveal whether your phone has been wireTapped, hacked or bugged
  • Dialling *#21# on your iPhone tells you whether you have call forwarding active on your mobile number.
  • If you dial *#21# and find that your calls are forwarded or diverted, you can simply dial ##21# or ##002# to cancel the forwarding.

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