Secret Codes guide
*#591# on iPhone: Check Multiple Subscriber Profile
By Muhammad Shahid · · 4 min read
Quick answer
*#591#: Interrogate the first of the alternate line profiles a SIM can carry. Multiple Subscriber Profile is specified in 3GPP TS 22. 097 and appears in TS 22. 030 Annex B with service code 59n, where n runs from 1 to 4.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | *#591# |
|---|---|
| What it does | Interrogate the first of the alternate line profiles a SIM can carry. |
| Published for | AT&T and T-Mobile |
| Type | Support varies |
Interrogate the first of the alternate line profiles a SIM can carry. This page explains what *#591# does, how to use it on an iPhone and which carriers it applies to.
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What does *#591# do?
Multiple Subscriber Profile is specified in 3GPP TS 22.097 and appears in TS 22.030 Annex B with service code 59n, where n runs from 1 to 4. It lets one SIM carry up to four separate subscriber profiles, each with its own number and its own supplementary service settings, which is how two line business SIMs worked in some markets. Replace the final digit to interrogate profiles 2 through 4.
This is genuinely the closest thing the specification offers to a multi line or alternate number interrogation, and it is the honest answer to the common question of whether an MMI string can read back your own phone number. There is no standard MMI code that returns your MSISDN. Any list claiming otherwise is describing a carrier specific USSD service, not a 3GPP procedure.
US carriers do not sell MSP. Dual line on iPhone is achieved with a second physical SIM or a second eSIM profile instead, which is a completely different mechanism.
How do I use *#591#?
- Open the Phone app and tap Keypad.
- Type *#591# 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 | Real in the specification, effectively absent from US networks. Included to answer the question honestly rather than because it is likely to work. |
Related call barring and sim pin codes
- **052*12345678*1234*1234#: Unblock PIN2 With the PUK2
- What MMI Error Messages Mean
- **05*12345678*1234*1234#: Unblock a SIM With the PUK
- **042*0000*1234*1234#: Change Your SIM PIN2
- **04*0000*1234*1234#: Change Your SIM PIN
- #43*11#: Turn Off Call Waiting for Voice Only
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 *#591# do on iPhone?
Interrogate the first of the alternate line profiles a SIM can carry. Multiple Subscriber Profile is specified in 3GPP TS 22. 097 and appears in TS 22. 030 Annex B with service code 59n, where n runs from 1 to 4.
What else should I know about *#591#?
t lets one SIM carry up to four separate subscriber profiles, each with its own number and its own supplementary service settings, which is how two line business SIMs worked in some markets. Replace the final digit to interrogate profiles 2 through 4.
What are the steps for *#591#?
1. Open the Phone app and tap Keypad. 2. Type *#591# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use *#591#?
On the keypad of the Phone app.
Do I need to press Call after typing *#591#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is *#591# 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 *#591# work on?
It is published for AT&T and T-Mobile. Real in the specification, effectively absent from US networks. Included to answer the question honestly rather than because it is likely to work.
Does *#591# 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 *#591# 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 *#591# 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 *#591#?
**052*12345678*1234*1234#: Unblock PIN2 With the PUK2. Clear a blocked PIN2 using the second unblocking key.
What else is in this category?
What MMI Error Messages Mean. How to read the replies an iPhone gives after dialling a service code.
Sources
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