# *43*11# on iPhone: Turn On Call Waiting for Voice Only URL: https://byshahid.com/blog/turn-on-call-waiting-for-voice-only-star-43-star-11-iphone/ App: Secret Codes: IMEI & Carrier (https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322) Author: Muhammad Shahid Updated: 2026-11-04 > *43*11#: Enable call waiting for telephony while leaving other services alone. Service code 43 is call waiting. The 11 after it is a basic service group code from TS 22. 030 Annex C, where 11 means telephony. Adding it narrows the request so that call waiting is activated for voice calls specifically rather than for every basic service the subscription carries. - **Code:** *43*11# - **What it does:** Enable call waiting for telephony while leaving other services alone. - **Published for:** AT&T and T-Mobile - **Type:** GSM networks Enable call waiting for telephony while leaving other services alone. This page explains what `*43*11#` 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 *43*11# do? Service code 43 is call waiting. The 11 after it is a basic service group code from TS 22.030 Annex C, where 11 means telephony. Adding it narrows the request so that call waiting is activated for voice calls specifically rather than for every basic service the subscription carries. On a modern iPhone the plain [*43#](/blog/turn-on-call-waiting-star-43-iphone/) form and the Settings toggle both do the job, so the value of the narrowed form is mostly diagnostic. If the unqualified activation is rejected but this one is accepted, the network is objecting to one of the other basic service groups rather than to call waiting itself. Other codes from the same table include 10 for all teleservices, 16 for short message services and 12 for all data teleservices. ## How do I use *43*11#? - Open the Phone app and tap Keypad. - Type *43*11# 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 | Accepted on AT&T and T-Mobile and their MVNOs, which run GSM supplementary services. Verizon and UScellular handle call waiting differently and are not included. | _Screenshot: The Secret Codes detail screen shows the steps, the carriers and an Open in Phone button._ ## Related call barring and sim pin codes - [*#300#: Check Calling Name Presentation](/blog/check-calling-name-presentation-star-hash-300-iphone/) - [#43*11#: Turn Off Call Waiting for Voice Only](/blog/turn-off-call-waiting-for-voice-only-hash-43-star-11-iphone/) - [**03*330*0000*1234*1234#: Change the Call Barring Password](/blog/change-the-call-barring-password-star-star-03-star-330-iphone/) - [**04*0000*1234*1234#: Change Your SIM PIN](/blog/change-your-sim-pin-star-star-04-star-0000-iphone/) - [*#353#: Check All Incoming Barring](/blog/check-all-incoming-barring-star-hash-353-iphone/) - [**042*0000*1234*1234#: Change Your SIM PIN2](/blog/change-your-sim-pin2-star-star-042-star-0000-iphone/) See all [call barring and sim pin codes](/blog/iphone-codes/call-barring-and-sim/) 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. **Secret Codes: IMEI & Carrier** is free on the App Store: https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322 ## FAQ ### What does *43*11# do on iPhone? Enable call waiting for telephony while leaving other services alone. Service code 43 is call waiting. The 11 after it is a basic service group code from TS 22. 030 Annex C, where 11 means telephony. ### What else should I know about *43*11#? Adding it narrows the request so that call waiting is activated for voice calls specifically rather than for every basic service the subscription carries. On a modern iPhone the plain *43# form and the Settings toggle both do the job, so the value of the narrowed form is mostly diagnostic. ### What are the steps for *43*11#? 1. Open the Phone app and tap Keypad. 2. Type *43*11# exactly as written. 3. Press the green Call button and wait for the result. ### Where do I use *43*11#? On the keypad of the Phone app. ### Do I need to press Call after typing *43*11#? Yes. Type it on the Phone keypad, then press the green Call button. ### Is *43*11# 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 *43*11# work on? It is published for AT&T and T-Mobile. Accepted on AT&T and T-Mobile and their MVNOs, which run GSM supplementary services. Verizon and UScellular handle call waiting differently and are not included. ### Does *43*11# 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 *43*11# 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 *43*11# 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 *43*11#? *#300#: Check Calling Name Presentation. Ask whether the network sends you the caller's name, not just the number. ### What else is in this category? #43*11#: Turn Off Call Waiting for Voice Only. Disable call waiting for voice calls specifically. ## Sources - [3GPP TS 22.030: Man-Machine Interface of the phone](https://www.3gpp.org/dynareport/22030.htm)