# **004*[number]# on iPhone: Set All Conditional Forwarding URL: https://byshahid.com/blog/set-all-conditional-forwarding-star-star-004-star-number-iphone/ App: Secret Codes: IMEI & Carrier (https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322) Author: Muhammad Shahid Updated: 2026-11-04 > **004*[number]#: Point busy, no-answer and unreachable at one number. Registers the same destination for all three conditional rules while leaving unconditional forwarding alone — so your iPhone still rings first. - **Code:** **004*[number]# - **What it does:** Point busy, no-answer and unreachable at one number. - **Published for:** AT&T and T-Mobile - **Type:** GSM networks Point busy, no-answer and unreachable at one number. This page explains what `**004*[number]#` 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](https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322). ## What does **004*[number]# do? Registers the same destination for all three conditional rules while leaving unconditional forwarding alone — so your iPhone still rings first. ## How do I use **004*[number]#? - Open the Phone app and tap Keypad. - Type **004*[number]#, replacing [number] with the full phone number, including the area code. - Press the green Call button. ## Which carriers does this apply to? | Published for | AT&T and T-Mobile | | Type | GSM networks | | Good to know | GSM networks only. | _Screenshot: The Secret Codes detail screen shows the steps, the carriers and an Open in Phone button._ ## Related call forwarding codes - [*#004#: Check Conditional Forwarding](/blog/check-conditional-forwarding-star-hash-004-iphone/) - [*72[number]: Turn On Call Forwarding (Verizon / UScellular)](/blog/turn-on-call-forwarding-verizon-uscellular-star-72-number-iphone/) - [##004#: Erase Conditional Forwarding Only](/blog/erase-conditional-forwarding-only-hash-hash-004-iphone/) - [*73: Turn Off Call Forwarding (Verizon / UScellular)](/blog/turn-off-call-forwarding-verizon-uscellular-star-73-iphone/) - [**002*[number]#: Forward Everything To One Number](/blog/forward-everything-to-one-number-star-star-002-star-number-iphone/) - [*71[number]: Forward Only When Busy Or Unanswered (Verizon)](/blog/forward-only-when-busy-or-unanswered-verizon-star-71-number-iphone/) See all [call forwarding codes](/blog/iphone-codes/call-forwarding/) or [every category of iPhone codes](/blog/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. **Secret Codes: IMEI & Carrier** is free on the App Store: https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322 ## FAQ ### What does **004*[number]# do on iPhone? Point busy, no-answer and unreachable at one number. Registers the same destination for all three conditional rules while leaving unconditional forwarding alone — so your iPhone still rings first. ### What are the steps for **004*[number]#? 1. Open the Phone app and tap Keypad. 2. Type **004*[number]#, replacing [number] with the full phone number, including the area code. 3. Press the green Call button. ### Where do I use **004*[number]#? On the keypad of the Phone app. ### How do I add the number to **004*[number]#? Replace [number] with the full phone number, including the area code, then press Call. ### Is **004*[number]# 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*[number]# work on? It is published for AT&T and T-Mobile. GSM networks only. ### Does **004*[number]# 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*[number]# 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*[number]# 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*[number]#? *#004#: Check Conditional Forwarding. Read back busy, no-answer and unreachable rules together. ### What else is in this category? *72[number]: Turn On Call Forwarding (Verizon / UScellular). The classic US feature code for immediate forwarding. ### Can I find **004*[number]# 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 - [3GPP TS 22.030: Man-Machine Interface of the phone](https://www.3gpp.org/dynareport/22030.htm) - [Verizon Support](https://www.verizon.com/support/)