iPhone & iPad · Dial codes, SIM & network test
Secret Codes guides and tips
317 verified iPhone dial codes for IMEI, call forwarding, caller ID, voicemail, eSIM and carrier services, plus a full device diagnostic suite. Nothing is locked.
Quick answer
Secret Codes: IMEI & Carrier is a free iPhone & iPad app by Muhammad Shahid Khan (Dial codes, SIM & network test). This page lists all 10 guides for it. Each one answers a single real question in plain language, with screenshots from the app.
Secret CodesDial codes, SIM & network test · Free on the App StoreDownload free →| Developer | Muhammad Shahid Khan |
|---|---|
| Price | Free on the App Store |
| Platform | iPhone & iPad |
| Guides | 10 |
| Languages | English, עברית, 简体中文, Español |
All Secret Codes guides
01iPhone Secret Codes That Actually Work in 2026 (and the Ones That Don’t)*#06# shows your IMEI, *3001#12345#* opens Field Test, *#21# checks call forwarding, #31# hides your number. Every iPhone dial code that works, and the ones that don't.
02How to Check Your IMEI on iPhone (5 Ways, Even Without the Phone)Dial *#06# and your iPhone shows its IMEI instantly. Or find it in Settings > General > About, on the SIM tray, the box, or your Apple Account if the phone is lost.
03Call Forwarding Codes for iPhone: *#21#, ##002# and the Full GSM List##002# cancels all call forwarding, *#21# checks if it is on, ##21# turns it off and **21*number# forwards every call. The full GSM list, iPhone Settings and US carriers.
04How to Hide Your Caller ID on iPhone (#31#, *67 and Settings)Dial #31# (or *67 in the US) before a number to hide it for one call, or turn off Show My Caller ID in Settings for every call. How to check it, and when it won't work.- 05How to Check if Your iPhone Is Unlocked (Carrier Lock Explained)Check if your iPhone is carrier-locked in Settings > General > About. What "No SIM restrictions" means, how unlocking works, and what to check when buying used.
06What Does ##002# Do on iPhone? Cancel All Call Forwarding (and Keep Your Voicemail)##002# cancels every type of call forwarding on GSM networks. What it does on iPhone, the message you see, why voicemail can stop working, and how to fix it.- 07*#21#, ##21# and **21*: What These Call Forwarding Codes Mean on iPhoneWhat *#21#, ##21#, #21# and **21* do on iPhone, how to read the *#21# reply, the "phone is tapped" myth, and the **21* call forwarding scam to avoid.
- 08*#31#, #31# and *31# on iPhone: What They Do and How to Turn Them OffWhat *#31#, #31# and *31# do on iPhone, whether #31# still works, how to read the *#31# reply, and how to stop your calls showing as No Caller ID.
- 09iPhone Field Test Mode (*3001#12345#*): How to Check Your Real Signal StrengthOpen Field Test with *3001#12345#*, find RSRP, RSRQ and SINR, read what the numbers mean, and use them to find the best signal at home. Works on any iPhone.
- 10Android Secret Codes on iPhone: *#*#4636#*#*, *#0*# and What to Use InsteadWhy *#*#4636#*#*, *#0*# and other Android codes do nothing on iPhone, plus the iPhone equivalent for each: battery health, test screens, Wi-Fi address and more.
Common questions about Secret Codes
Do secret codes work on iPhone?
Some do. Standard GSM codes like *#06#, call forwarding and call waiting codes, carrier codes and Apple’s Field Test code work. Android engineering menu codes do not. Read guide →
How do I check my IMEI on iPhone?
Dial *#06# in the Phone app, or go to Settings > General > About and scroll down to IMEI. Read guide →
How do I check if my calls are forwarded?
Dial *#21# for unconditional forwarding, and *#67#, *#61# and *#62# for busy, no answer and unreachable forwarding. Read guide →
How do I hide my number on iPhone for one call?
Dial #31# before the number on many GSM networks, or *67 before the number in the US. Read guide →
How do I check if my iPhone is unlocked?
Go to Settings > General > About and look at Carrier Lock. "No SIM restrictions" means it is unlocked. Read guide →
What does ##002# do?
It erases every call forwarding rule on your line at once: all calls, when busy, when not answered and when unreachable. It is a standard GSM code handled by your network. Read guide →
What does *#21# do on iPhone?
It checks whether unconditional call forwarding is on. It only shows the status and changes nothing. Read guide →
What is #31# used for?
Dialled before a number on GSM networks, #31# hides your caller ID for that call. The other person sees No Caller ID or Private. Read guide →
What is *3001#12345#*?
Apple’s code for Field Test mode, a hidden screen that shows detailed cellular measurements, including real signal strength in dBm. Read guide →
Does *#*#4636#*#* work on iPhone?
No. It opens a testing menu built into Android. iOS has no hidden engineering menus, so nothing happens. Read guide →
