Secret Codes guide
*#004# on iPhone: Check Conditional Forwarding
By Muhammad Shahid · · 3 min read
Quick answer
*#004#: Read back busy, no-answer and unreachable rules together. Interrogates the three conditional forwarding services and returns them in a single response. GSM networks only.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | *#004# |
|---|---|
| What it does | Read back busy, no-answer and unreachable rules together. |
| Published for | AT&T and T-Mobile |
| Type | GSM networks |
Read back busy, no-answer and unreachable rules together. This page explains what *#004# does, how to use it on an iPhone and which carriers it applies to.
I build Secret Codes: IMEI & Carrier, a free iPhone app with 317 checked codes and guides, including this one. If you would rather tap than memorise, get Secret Codes on the App Store.
What does *#004# do?
Interrogates the three conditional forwarding services and returns them in a single response.
How do I use *#004#?
- Open the Phone app and tap Keypad.
- Type *#004# exactly as written.
- Press the green Call button and wait for the result.
Which carriers does this apply to?
| Published for | AT&T and T-Mobile |
|---|---|
| Type | GSM networks |
| Good to know | GSM networks only. |
Related call forwarding codes
- ##004#: Erase Conditional Forwarding Only
- **004*[number]#: Set All Conditional Forwarding
- **002*[number]#: Forward Everything To One Number
- *72[number]: Turn On Call Forwarding (Verizon / UScellular)
- *#002#: Check All Forwarding Rules
- *73: Turn Off Call Forwarding (Verizon / UScellular)
See all call forwarding codes or every category of iPhone codes.
How Secret Codes helps
Secret Codes keeps this and every other entry a search away. Pick your carrier once and each entry says whether it is published for your line. You can save favourites, add a private note, and record whether a code worked on your line. This entry is part of Secret Codes Pro.
Frequently asked questions
What does *#004# do on iPhone?
Read back busy, no-answer and unreachable rules together. Interrogates the three conditional forwarding services and returns them in a single response.
What are the steps for *#004#?
1. Open the Phone app and tap Keypad. 2. Type *#004# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use *#004#?
On the keypad of the Phone app.
Do I need to press Call after typing *#004#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is *#004# a hidden or secret code?
No. It is a standard GSM code, handled by the network rather than by a hidden menu on the iPhone.
Which carriers does *#004# work on?
It is published for AT&T and T-Mobile. GSM networks only.
Does *#004# work on Android phones too?
GSM codes are a network standard, so they generally behave the same on any phone on a network that supports them.
Will *#004# work outside the US?
It depends on the network you are on. GSM codes are a standard, but each network decides which it supports.
What if *#004# does not work on my iPhone?
Check that it applies to your carrier first, because carriers decide which services they offer and can change them. If it should apply to your line, contact your carrier.
What is related to *#004#?
##004#: Erase Conditional Forwarding Only. Clear the busy, no-answer and unreachable rules.
What else is in this category?
**004*[number]#: Set All Conditional Forwarding. Point busy, no-answer and unreachable at one number.
Can I find *#004# in an app?
Yes. Secret Codes, a free iPhone app, includes it with its steps and carrier details, as part of Secret Codes Pro.
Sources
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