# *#351# on iPhone: Check Roaming Incoming Barring URL: https://byshahid.com/blog/check-roaming-incoming-barring-star-hash-351-iphone/ App: Secret Codes: IMEI & Carrier (https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322) Author: Muhammad Shahid Updated: 2026-11-04 > *#351#: See whether incoming calls are barred when you roam. Read only interrogation of barring of incoming calls while roaming. Needs no password and changes nothing. Useful as a pre travel check on a line whose settings you did not configure yourself. An error is far more likely than a real answer on AT&T or T-Mobile. - **Code:** *#351# - **What it does:** See whether incoming calls are barred when you roam. - **Published for:** AT&T and T-Mobile - **Type:** Support varies See whether incoming calls are barred when you roam. This page explains what `*#351#` 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 *#351# do? Read only interrogation of barring of incoming calls while roaming. Needs no password and changes nothing. Useful as a pre travel check on a line whose settings you did not configure yourself. An error is far more likely than a real answer on AT&T or T-Mobile. ## How do I use *#351#? - Open the Phone app and tap Keypad. - Type *#351# 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 | Harmless to dial anywhere. Most US lines answer with an error. | _Screenshot: The Secret Codes detail screen shows the steps, the carriers and an Open in Phone button._ ## Related call barring and sim pin codes - [#351*0000#: Cancel Roaming Incoming Barring](/blog/cancel-roaming-incoming-barring-hash-351-star-0000-iphone/) - [#330*0000#: Cancel All Call Barring](/blog/cancel-all-call-barring-hash-330-star-0000-iphone/) - [*351*0000#: Bar Incoming Calls While Roaming](/blog/bar-incoming-calls-while-roaming-star-351-star-0000-iphone/) - [*#330#: Check All Barring Services](/blog/check-all-barring-services-star-hash-330-iphone/) - [*#35#: Check Incoming Call Barring](/blog/check-incoming-call-barring-star-hash-35-iphone/) - [#333*0000#: Cancel All Outgoing Barring](/blog/cancel-all-outgoing-barring-hash-333-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 *#351# do on iPhone? See whether incoming calls are barred when you roam. Read only interrogation of barring of incoming calls while roaming. Needs no password and changes nothing. Useful as a pre travel check on a line whose settings you did not configure yourself. ### What else should I know about *#351#? An error is far more likely than a real answer on AT&T or T-Mobile. ### What are the steps for *#351#? 1. Open the Phone app and tap Keypad. 2. Type *#351# exactly as written. 3. Press the green Call button and wait for the result. ### Where do I use *#351#? On the keypad of the Phone app. ### Do I need to press Call after typing *#351#? Yes. Type it on the Phone keypad, then press the green Call button. ### Is *#351# 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 *#351# work on? It is published for AT&T and T-Mobile. Harmless to dial anywhere. Most US lines answer with an error. ### Does *#351# 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 *#351# 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 *#351# 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 *#351#? #351*0000#: Cancel Roaming Incoming Barring. Receive calls normally again while roaming. ### What else is in this category? #330*0000#: Cancel All Call Barring. Clear every barring service on the line in one command. ## Sources - [3GPP TS 22.030: Man-Machine Interface of the phone](https://www.3gpp.org/dynareport/22030.htm)