# *#30# on iPhone: Check Incoming Caller ID Service URL: https://byshahid.com/blog/check-incoming-caller-id-service-star-hash-30-iphone/ App: Secret Codes: IMEI & Carrier (https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322) Author: Muhammad Shahid Updated: 2026-11-04 > *#30#: See whether you are able to receive caller ID. Interrogates Calling Line Identification Presentation — the service that lets you see who is calling. It should be provisioned on every modern US line, so this is mostly a diagnostic when incoming numbers stop showing. - **Code:** *#30# - **What it does:** See whether you are able to receive caller ID. - **Published for:** AT&T and T-Mobile - **Type:** GSM networks See whether you are able to receive caller ID. This page explains what `*#30#` 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 *#30# do? Interrogates Calling Line Identification Presentation — the service that lets you see who is calling. It should be provisioned on every modern US line, so this is mostly a diagnostic when incoming numbers stop showing. ## How do I use *#30#? - Open the Phone app and tap Keypad. - Type *#30# 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. A response of "not provisioned" is worth raising with your carrier. | _Screenshot: The Secret Codes detail screen shows the steps, the carriers and an Open in Phone button._ ## Related caller id codes - [*31#[number]: Show Your Number (GSM Style)](/blog/show-your-number-gsm-style-star-31-hash-number-iphone/) - [*#76#: Check Connected Line Presentation](/blog/check-connected-line-presentation-star-hash-76-iphone/) - [#31#[number]: Hide Your Number (GSM Style)](/blog/what-is-31-code-iphone/) - [*#77#: Check Connected Line Restriction](/blog/check-connected-line-restriction-star-hash-77-iphone/) - [*#31#: Check Caller ID Setting](/blog/check-caller-id-setting-star-hash-31-iphone/) - [#662#: Turn On Scam Block (T-Mobile)](/blog/turn-on-scam-block-t-mobile-hash-662-iphone/) See all [caller id codes](/blog/iphone-codes/caller-id/) 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. This entry is part of Secret Codes Pro. **Secret Codes: IMEI & Carrier** is free on the App Store: https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322 ## FAQ ### What does *#30# do on iPhone? See whether you are able to receive caller ID. Interrogates Calling Line Identification Presentation — the service that lets you see who is calling. It should be provisioned on every modern US line, so this is mostly a diagnostic when incoming numbers stop showing. ### What are the steps for *#30#? 1. Open the Phone app and tap Keypad. 2. Type *#30# exactly as written. 3. Press the green Call button and wait for the result. ### Where do I use *#30#? On the keypad of the Phone app. ### Do I need to press Call after typing *#30#? Yes. Type it on the Phone keypad, then press the green Call button. ### Is *#30# 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 *#30# work on? It is published for AT&T and T-Mobile. GSM networks only. A response of "not provisioned" is worth raising with your carrier. ### Does *#30# 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 *#30# 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 *#30# 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 *#30#? *31#[number]: Show Your Number (GSM Style). The GSM per-call caller ID override. ### What else is in this category? *#76#: Check Connected Line Presentation. See whether you are shown the number you actually reached. ### Can I find *#30# in an app? Yes. Secret Codes, a free iPhone app, includes it with its steps and carrier details, as part of Secret Codes Pro. ## Sources - [3GPP TS 22.030: Man-Machine Interface of the phone](https://www.3gpp.org/dynareport/22030.htm) - [Apple Support: iPhone User Guide](https://support.apple.com/guide/iphone/welcome/ios)