Secret Codes guide
**03*330*0000*1234*1234# on iPhone: Change the Call Barring Password
By Muhammad Shahid · · 4 min read
Quick answer
**03*330*0000*1234*1234#: Register a new network password for the call barring services. TS 22. 030 section 6. 5. 4 defines this as registration of a new password, and registration is the only operation allowed.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | **03*330*0000*1234*1234# |
|---|---|
| What it does | Register a new network password for the call barring services. |
| Published for | AT&T and T-Mobile |
| Type | Support varies |
Register a new network password for the call barring services. This page explains what **03*330*0000*1234*1234# does, how to use it on an iPhone and which carriers it applies to.
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What does **03*330*0000*1234*1234# do?
TS 22.030 section 6.5.4 defines this as registration of a new password, and registration is the only operation allowed. A supplementary service password can never be erased or read back, which is why there is no interrogation form and why a forgotten barring password can only be reset by the carrier.
Read the template as **03*ZZoldnew*new#. The 330 is fixed, and is the identifier the specification assigns to the barring services. The first four digits after it are your current password, then the new one twice. So a change from 0000 to 1234 is exactly the string shown. The spec also accepts a single leading star, *03*330oldnew*new#, and a form with the 330 omitted, **03*oldnew*new#, which sets a common password across every service that uses one.
This password has nothing to do with your SIM PIN, your voicemail PIN or your carrier account PIN. It exists solely for the barring family.
Important: There is no way to read a supplementary service password back or to erase it. If you change it and forget the new value you will have to ask the carrier to reset it, and repeated wrong attempts can block the password entirely at the network per 3GPP TS 22.004.
How do I use **03*330*0000*1234*1234#?
- Open the Phone app and tap Keypad.
- Type **03*330*0000*1234*1234# 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 | Support varies |
| Good to know | Only works on lines that actually carry a barring subscription. On most US consumer accounts there is no barring password to change and the string returns an error. |
Related call barring and sim pin codes
- *#353#: Check All Incoming Barring
- *#300#: Check Calling Name Presentation
- #353*0000#: Cancel All Incoming Barring
- *43*11#: Turn On Call Waiting for Voice Only
- *#333#: Check All Outgoing Barring
- #43*11#: Turn Off Call Waiting for Voice Only
See all call barring and sim pin codes or every category of iPhone codes.
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Frequently asked questions
What does **03*330*0000*1234*1234# do on iPhone?
Register a new network password for the call barring services. TS 22. 030 section 6. 5. 4 defines this as registration of a new password, and registration is the only operation allowed.
What else should I know about **03*330*0000*1234*1234#?
supplementary service password can never be erased or read back, which is why there is no interrogation form and why a forgotten barring password can only be reset by the carrier. Read the template as **03*ZZoldnew*new#. The 330 is fixed, and is the identifier the specification assigns to the barring services.
What are the steps for **03*330*0000*1234*1234#?
1. Open the Phone app and tap Keypad. 2. Type **03*330*0000*1234*1234# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use **03*330*0000*1234*1234#?
On the keypad of the Phone app.
Do I need to press Call after typing **03*330*0000*1234*1234#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is **03*330*0000*1234*1234# a hidden or secret code?
No. It is a published service, not a hidden menu. iPhones do not have Android-style engineering menus.
Which carriers does **03*330*0000*1234*1234# work on?
It is published for AT&T and T-Mobile. Only works on lines that actually carry a barring subscription. On most US consumer accounts there is no barring password to change and the string returns an error.
Is there anything to watch out for with **03*330*0000*1234*1234#?
There is no way to read a supplementary service password back or to erase it. If you change it and forget the new value you will have to ask the carrier to reset it, and repeated wrong attempts can block the password entirely at the network per 3GPP TS 22.004.
Does **03*330*0000*1234*1234# work on Android phones too?
It is handled by the carrier or service rather than the iPhone, so it is not tied to one phone brand. Check with your carrier.
Will **03*330*0000*1234*1234# work outside the US?
It is published for US carriers and services, so do not count on it abroad. Ask your carrier before you travel.
What if **03*330*0000*1234*1234# 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 **03*330*0000*1234*1234#?
*#353#: Check All Incoming Barring. Interrogate both incoming barring services at once.
Sources
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