Secret Codes guide
*43# on iPhone: Turn On Call Waiting
By Muhammad Shahid · · 3 min read
Quick answer
*43#: Allow a second call to interrupt an active one. Activates call waiting at network level. With it on, a second incoming call plays a tone and appears on screen with hold, end and decline options.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | *43# |
|---|---|
| What it does | Allow a second call to interrupt an active one. |
| Published for | AT&T and T-Mobile |
| Type | GSM networks |
Allow a second call to interrupt an active one. This page explains what *43# 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 *43# do?
Activates call waiting at network level. With it on, a second incoming call plays a tone and appears on screen with hold, end and decline options.
How do I use *43#?
- Open the Phone app and tap Keypad.
- Type *43# 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 network and signal
- *#43#: Check Call Waiting
- #43#: Turn Off Call Waiting
- *#5005*7672#: Check Your SMS Centre Number
- *#33#: Check Call Barring
- *3001#12345#*: Field Test Mode
- Choose Your Network Manually
See all network and signal 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.
Frequently asked questions
What does *43# do on iPhone?
Allow a second call to interrupt an active one. Activates call waiting at network level. With it on, a second incoming call plays a tone and appears on screen with hold, end and decline options.
What are the steps for *43#?
1. Open the Phone app and tap Keypad. 2. Type *43# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use *43#?
On the keypad of the Phone app.
Do I need to press Call after typing *43#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is *43# 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# work on?
It is published for AT&T and T-Mobile. GSM networks only.
Does *43# 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# 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# 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#?
*#43#: Check Call Waiting. See whether a second incoming call will interrupt you.
What else is in this category?
#43#: Turn Off Call Waiting. Send second calls straight to voicemail instead.
Can I find *43# in an app?
Yes. Secret Codes, a free iPhone app, includes it with its steps and carrier details.
Sources
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