Secret Codes guide
*33*0000# on iPhone: Bar All Outgoing Calls
By Muhammad Shahid · · 4 min read
Quick answer
*33*0000#: Ask the network to block every outgoing call from your line. Service code 33 is BAOC, Barring of All Outgoing Calls, defined in 3GPP TS 22. 088 and given its MMI form in TS 22. 030 Annex B. Once the network accepts it, every outbound call except emergency numbers is refused at the switch.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | *33*0000# |
|---|---|
| What it does | Ask the network to block every outgoing call from your line. |
| Published for | AT&T and T-Mobile |
| Type | Support varies |
Ask the network to block every outgoing call from your line. This page explains what *33*0000# does, how to use it on an iPhone and which carriers it applies to.
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What does *33*0000# do?
Service code 33 is BAOC, Barring of All Outgoing Calls, defined in 3GPP TS 22.088 and given its MMI form in TS 22.030 Annex B. Once the network accepts it, every outbound call except emergency numbers is refused at the switch. It survives a reboot, a SIM swap into another handset, and airplane mode, because the setting lives in the carrier network and not on the iPhone.
The 0000 in the template is not part of the code. It stands for your call barring password, a four digit code that is separate from your SIM PIN, your voicemail PIN and your account PIN. Carriers that provision barring typically ship it as 0000 or 1234, but many set something else. Replace those four digits with your own before dialling.
The spec also allows a basic service group after the password, so *33*0000*11# would bar outgoing telephony only and leave data services alone. That refinement is only meaningful on a line where plain barring already works.
Important: If this does succeed you will not be able to place calls until you deactivate it with #33*password#, and the block follows your line rather than your phone. Do not experiment with it on a number you depend on.
How do I use *33*0000#?
- Open the Phone app and tap Keypad.
- Type *33*0000# 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 | Rarely provisioned on US consumer lines. On most AT&T and T-Mobile accounts this returns an error because the subscription never included call barring, which is the expected result rather than a fault. |
Related call barring and sim pin codes
- #33*0000#: Cancel Outgoing Call Barring
- *331*0000#: Bar Outgoing International Calls
- #331*0000#: Cancel International Call Barring
- *#331#: Check International Call Barring
- *332*0000#: Bar International Calls Except Home
- #332*0000#: Cancel Except-Home Barring
See all call barring and sim pin 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 *33*0000# do on iPhone?
Ask the network to block every outgoing call from your line. Service code 33 is BAOC, Barring of All Outgoing Calls, defined in 3GPP TS 22. 088 and given its MMI form in TS 22. 030 Annex B.
What else should I know about *33*0000#?
nce the network accepts it, every outbound call except emergency numbers is refused at the switch. It survives a reboot, a SIM swap into another handset, and airplane mode, because the setting lives in the carrier network and not on the iPhone. The 0000 in the template is not part of the code.
What are the steps for *33*0000#?
1. Open the Phone app and tap Keypad. 2. Type *33*0000# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use *33*0000#?
On the keypad of the Phone app.
Do I need to press Call after typing *33*0000#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is *33*0000# 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 *33*0000# work on?
It is published for AT&T and T-Mobile. Rarely provisioned on US consumer lines. On most AT&T and T-Mobile accounts this returns an error because the subscription never included call barring, which is the expected result rather than a fault.
Is there anything to watch out for with *33*0000#?
If this does succeed you will not be able to place calls until you deactivate it with #33*password#, and the block follows your line rather than your phone. Do not experiment with it on a number you depend on.
Does *33*0000# 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 *33*0000# 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 *33*0000# 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 *33*0000#?
#33*0000#: Cancel Outgoing Call Barring. Lift a block on outgoing calls that was set with *33*.
Sources
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