Setting Interrogation Succeeded: Here's What It Means

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Learn how to interpret the results of *#21# and other shortcodes

Written by Nicole Levine, MFA

Last Updated: April 6, 2026 Fact Checked

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Setting Interrogation Succeeded Meaning

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How the Codes Work

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FAQ

If you've tried using a special code on your phone to see if your calls are being forwarded (or if your phone is hacked) and seen a message that says "Setting Interrogation Succeeded" above options like "Voice Call Forwarding" and "Data Call Forwarding," you're probably wondering what that means. In this article, we'll explain what messages like "Setting Interrogation Succeeded" and "Setting Interrogation Failed" mean and why you might be seeing them on your phone. We'll also explain what codes like *#21#, *#67#, and other codes can tell you about your iPhone or Android.

What to Do If You See "Setting Interrogation Succeeded."

If you enter a code into your phone and see "Setting Interrogation Succeeded," it means your carrier recognizes the code you entered. If you see "Setting Interrogation Failed," your carrier doesn't support the code. Neither of these messages tells you whether your phone is or is not hacked or tapped.

Section 1 of 3:

What is "Setting Interrogation Succeeded?"

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"Setting Interrogation Succeeded" means the code you entered works with your mobile carrier. If you're using a code like *#67#, *#21#, or *#62# to check the status of call forwarding on your phone, you'll see "Setting Interrogation Succeded" if your mobile carrier supports the code and was able to send a response. It doesn't mean your phone is hacked–it just means your carrier understands the code you entered. On the other hand, if you see "Setting Interrogation Failed," the code you entered is not supported by your carrier.^{[1]
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- These codes, also called USSD codes or MMI codes, will always say "Setting Interrogation Failed" if they're run on phones with carriers that don't support the codes themselves.
- You'll often see "Setting Interrogation Succeeded" on GSM carriers like T-Mobile, AT&T, Vodafone, EE, Orange, and Rogers.
- On Verizon, MetroPCS, Telus, and formerly CDMA networks, running *#67#, *#21#, or *#62# will result in "Setting Interrogation Failed."

Section 2 of 3:

Interpreting Call Forwarding Codes

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*#21#: Call forwarding for all calls If you've seen a video or article that says you can use this code to see if your phone is hacked or tapped, it's not really that simple–this code just tells you whether your calls are being forwarded, and if so, to which number. If your carrier supports the code, you'll see "Setting Interrogation Succeeded," followed by a list including Voice Call Forwarding, Data Call Forwarding, Fax Call Forwarding, and SMS Call Forwarding, and possibly other options.^{[2]
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- If you see "Enabled" on any of these types of calls and you're not receiving calls, your calls are being forwarded to the number listed.
- If you don't recognize the phone number, you can reset your call forwarding settings to the defaults by using the shortcode ##004#.^{[3]
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*#62#: Call forwarding when unreachable Entering this code into a phone that supports it will tell you whether your calls are being forwarded to a different number when you don't answer an inbound call. In many cases, you will see "Enabled" here, along with your carrier's voicemail phone number–this just means that when you don't answer the call, or if someone calls you when your phone is turned off, it'll be forwarded to your voicemail.
- If you don't recognize the phone number, in most cases, you shouldn't worry–it's just your carrier's default voicemail phone number.
- If you're absolutely positive the number shown is not your carrier's voicemail number, you can reset your call forwarding settings to ##62#. Just keep in mind that if you have voicemail through your carrier, it is 100% normal to see a forwarding phone number here.
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*#67#: Call forwarding when busy When you enter this code into a phone that supports it, you'll see whether calls to your phone will be forwarded to another number if your line is busy. For example, if someone calls you and your line is busy, the call will usually be forwarded to your voicemail number, such as +18056377249 for T-Mobile.
- If you know for sure that the number you see here is not related to your carrier, you can reset your settings using the code ##67#. However, this will just reset your settings to forward these missed calls to your carrier's default voicemail number.
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Other codes Depending on your carrier, there may be other codes you can enter to dive deeper into your phone's settings and make changes. Check out How to Run a USSD Code and How to Run USSD and MMI Codes for Android for lists of codes to try! Here are a few that may come in handy:^{[4]
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- *#06#: Show your phone's IMEI number
- *#*#232338#*#*: Show your Android's MAC address
- *#*#4636#*#*: Show your Android's usage info
- *5005*25371#: Enable test alerts for emergencies
- *3001#12345#*:^{[5]
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Section 3 of 3:

Frequently Asked Questions

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Can someone divert my calls without my knowledge? Yes, it is possible. Someone can divert your phone calls by gaining access to your phone or by tricking you into running malicious apps or codes. It is also possible for government entities to monitor your calls using spyware apps like Pegasus.^{[6]
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Does *#21 tell you if your phone is hacked? Not really. Entering this code will tell you whether your calls are being redirected to another phone number, which means someone other than you is getting your phone calls. It cannot tell you if someone is monitoring your calls, texts, or activity.
- To learn how to find out if your phone is hacked, check out our guides to detecting spyware on iPhone and Android.
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What happens if you dial *#21 on an iPhone? If you're using a GSM carrier like T-Mobile or AT&T, dialing this code will show you the status of your call forwarding settings. If any of the call types show as "enabled," those calls are being forwarded to the provided phone number.