Secret Codes guide
*#77# on iPhone: Check Connected Line Restriction
By Muhammad Shahid · · 3 min read
Quick answer
*#77#: See whether your line hides itself from callers who reach it. Connected Line Identification Restriction is the mirror of *#76#: it controls whether someone calling a number that forwards to you can see that the call landed on your line.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Code | *#77# |
|---|---|
| What it does | See whether your line hides itself from callers who reach it. |
| Published for | AT&T and T-Mobile |
| Type | GSM networks |
See whether your line hides itself from callers who reach it. This page explains what *#77# 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.
What does *#77# do?
Connected Line Identification Restriction is the mirror of *#76#: it controls whether someone calling a number that forwards to you can see that the call landed on your line.
How do I use *#77#?
- Open the Phone app and tap Keypad.
- Type *#77# 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. Frequently unprovisioned in the US. |
Related caller id codes
- *#76#: Check Connected Line Presentation
- #662#: Turn On Scam Block (T-Mobile)
- *#30#: Check Incoming Caller ID Service
- #632#: Turn Off Scam Block (T-Mobile)
- *31#[number]: Show Your Number (GSM Style)
- #787#: Check Scam Block Status (T-Mobile)
See all caller id 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 *#77# do on iPhone?
See whether your line hides itself from callers who reach it. Connected Line Identification Restriction is the mirror of *#76#: it controls whether someone calling a number that forwards to you can see that the call landed on your line.
What are the steps for *#77#?
1. Open the Phone app and tap Keypad. 2. Type *#77# exactly as written. 3. Press the green Call button and wait for the result.
Where do I use *#77#?
On the keypad of the Phone app.
Do I need to press Call after typing *#77#?
Yes. Type it on the Phone keypad, then press the green Call button.
Is *#77# 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 *#77# work on?
It is published for AT&T and T-Mobile. GSM networks only. Frequently unprovisioned in the US.
Does *#77# 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 *#77# 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 *#77# 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 *#77#?
*#76#: Check Connected Line Presentation. See whether you are shown the number you actually reached.
What else is in this category?
#662#: Turn On Scam Block (T-Mobile). Stop calls T-Mobile has identified as scams from ringing.
Can I find *#77# 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
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