iPhone Secret Codes & 5G/LTE Field Test Mode (dBm) Explorer (2026)

Search 60+ hidden iOS and GSM/LTE/5G MMI dialer codes (`*3001#12345#*`, `*#06#`, `*#21#`, `*#62#`) to audit unauthorized call forwarding, check EID/IMEI identity, and translate cellular RSRP/SINR dBm signal metrics.

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iPhone Field Test Mode & 60+ Secret iOS Dialer Codes Explorer — Interactive Console

Runs locally in your browser • Instant output

*3001#12345#* Field Test RSRP (dBm) & SINR (dB) Signal Analyzer

Measured RSRP (Reference Signal Received Power): -86 dBm

Measured SINR (Signal-to-Interference-plus-Noise): 16 dB

Verdict: GOOD / RELIABLE COVERAGE (Fast Streaming & Low Jitter)

*3001#12345#*5G/LTE Signal Field Test

iOS Hidden Field Test Mode Dashboard

Opens Apple's internal baseband engineering app showing 5G NR / LTE Band (n78, n41, Band 3), exact RSRP dBm, RSRQ, SINR, and Physical Cell ID (PCI).

*#06#SIM & IMEI Identity

Instant Hardware IMEI, IMEI2 (eSIM) & EID Barcode

Displays factory hardware serials without opening Settings. Compare against SIM tray engraving to verify genuine motherboard.

*#21#Anti-Stalker Forwarding Check

Audit All Unconditional Call/SMS/Data Forwarding

Shows if your voice calls, SMS texts, or sync data are silently mirrored or diverted to another number.

*#62#Anti-Stalker Forwarding Check

Audit Forwarding When Unreachable / No Service

Checks where calls go when your iPhone is in Airplane Mode or out of coverage.

*#67#Anti-Stalker Forwarding Check

Audit Call Forwarding When Busy / Declined

Verifies the destination number receiving calls when you tap 'Decline' on an incoming call.

*#61#Anti-Stalker Forwarding Check

Audit Forwarding When Unanswered & Ring Timer

Reveals how many seconds your phone rings before forwarding to voicemail or an external number.

##002#Anti-Stalker Forwarding Check

Emergency Master Reset: Wipe All Call Forwarding

Immediately clears all conditional and unconditional call/SMS diversions on your SIM.

*#31#Network & Billing

Check Outgoing Caller ID Anonymity Status

Verifies whether your mobile number is shown or hidden (CLIR) by default on outgoing calls.

#31# + PhoneNumberNetwork & Billing

One-Time Anonymous Call Prefix

Dial #31# followed by any phone number to mask your Caller ID for that single call.

*#43#Network & Billing

Query Call Waiting Network Status

Checks if carrier-level Call Waiting is active on Voice, Data, and Fax channels. (*43# to enable, #43# to disable).

*#33#Network & Billing

Check Outgoing Call & SMS Barring Status

Displays whether international calling or SMS outgoing restrictions are active on the line.

*#5005*7672#SIM & IMEI Identity

Inspect Carrier SMSC (Short Message Service Center)

Displays the exact carrier SMS routing gateway number programmed into your SIM/eSIM.

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2026 iPhone Secret Dialer Codes (iOS 18 / iOS 19 MMI & Field Test Table)

2026 Verified Reference

Quick Answer & 2026 Technical Summary (iphone secret codes field test mode)Updated 2026 Standard

On iPhone running iOS 18 or iOS 19, dialing `*3001#12345#*` launches Apple's hidden Field Test Mode to inspect live 5G NR / LTE RSRP signal strength in dBm, band aggregation, and cell tower PCI, while `*#21#` and `##002#` audit and reset carrier call forwarding.

Field Test: *3001#12345#* | Audit Forwarding: *#21# | Clear All Diversions: ##002#

Excellent 5G/LTE RSRP: -80 dBm to -90 dBm

Dead-Zone RSRP Threshold: Worse than -115 dBm

Anonymous Outbound Call: #31#<10-digit-number>

iPhone Dialer Code	Hidden iOS Function / Menu	Key Telemetry / Expected Output	Carrier & iOS Support
`3001#12345#`	Apple Hidden Field Test Mode Dashboard	5G NR / LTE Band, RSRP (dBm), RSRQ, SINR & Cell PCI	All iPhones (iOS 16 / 17 / 18 / 19)
`*#21#`	Unconditional Call, Data & SMS Forwarding Check	Voice / Data / Fax / SMS: Disabled	GSM & VoLTE Carriers Worldwide
`#61# / #62# / *#67#`	Conditional Forwarding (Unanswered / Unreachable / Busy)	Displays official carrier Voicemail gateway number	GSM / LTE / 5G SA Networks
`##002#`	Master Erasure of All iPhone Call Diversions	Setting Erasure Succeeded (All Call Forwarding)	Instant Carrier HSS Reset
`*#06#`	Instant IMEI, IMEI2 & eSIM EID Barcode Display	15-digit IMEI + 32-digit eSIM EID barcode	Works Offline Without SIM Card
`*#31# / #31#Number`	Caller ID Line Presentation Status & Per-Call Hide	Hides your phone number for the dialed outbound call	Supported by most GSM/VoLTE carriers

In-Depth ZerosUniverse Tutorial

60+ iPhone Secret Codes: Unlock Hidden iOS Diagnostics in 2026

Read our complete step-by-step editorial guide, architecture breakdown, and defensive best practices on ZerosUniverse.

Read Full Guide

How to Use iPhone Field Test Mode & 60+ Secret iOS Dialer Codes Explorer

Filter Secret Codes by Category or Search Keyword

Browse All, Security & Forwarding Audit, RF Diagnostics, Caller ID, or Carrier (AT&T, Verizon, T-Mobile) codes.

Copy Any Code into the Native iOS Phone Keypad

Tap Copy Code, open the Apple Phone app's Keypad tab, paste the string, and press the green Call button (if marked 'Press Call').

Test Your RSRP, RSRQ & SINR in the Field Test Lab

After dialing `*3001#12345#*`, enter your `rsrp0` (dBm) and `sinr0` (dB) values into the interactive sliders to evaluate your cell tower connection.

Run `##002#` If Unexpected Call Forwarding Appears

If `*#21#` or `*#67#` reveals an unfamiliar forwarding destination (other than your carrier's official voicemail center), dial `##002#` to wipe all diversions.

Key Capabilities & Technical Architecture

Searchable 60+ iOS & Carrier MMI Code Database

Categorized reference covering Diagnostics & Identity (`*#06#`), Call Forwarding Security Audits (`*#21#`, `##002#`), Call Waiting/Barring, Caller ID Privacy (`*67`), and Carrier Billing USSD codes.

Interactive Field Test Mode (`3001#12345#`) dBm Analyzer

Input your iPhone Field Test Mode RSRP (-44 to -140 dBm), RSRQ (-3 to -20 dB), and SINR (-5 to +30 dB) readings to calculate logarithmic milliwatt power, 5G/LTE band speed potential, and cell tower congestion.

1-Click Anti-Stalkerware Call Diversion Audit Workflow

Step-by-step verification sequence (`*#21#`, `*#61#`, `*#62#`, `*#67#`) to detect unauthorized voice/SMS/data forwarding and erase all conditional diversions globally with `##002#`.

Auto-Execute vs Press-Call Execution Badges

Clearly labels which codes trigger the instant the final `#` or `*` is tapped versus which MMI strings require pressing the green Phone Call button.

Practical Use Cases

Cellular Dead-Zone & Home Signal Booster Alignment

Use `*3001#12345#*` alongside our RSRP/SINR dBm calculator to measure true 3 dB (2× power) signal gains where Apple's 4-bar status icon is too coarse to show changes.

Mobile Privacy & SIM/Forwarding Tamper Check

Verify in 15 seconds that nobody with brief physical access to your unlocked phone configured conditional or unconditional call forwarding (`*21*` / `*62*`) to another number.

eSIM Provisioning & Stolen Device IMEI/EID Lookup

Display scannable IMEI1, IMEI2, EID, and MEID barcodes instantly via `*#06#` without navigating through iOS Settings.

Frequently Asked Questions (FAQs)

Why does dialing *#21# or *#62# sometimes show an active phone number even if I wasn't hacked?+

Viral social media posts often claim that seeing a phone number under `*#61#` (When Unanswered), `*#62#` (When Unreachable), or `*#67#` (When Busy) proves your phone is tapped. In reality, mobile carriers use Conditional Call Forwarding by default to route unanswered or busy calls to your carrier's official Voicemail Deposit Center number. Only unconditional forwarding (`*#21#` active for all calls) or forwarding to an unrecognized personal phone number indicates tampering.

How do I read RSRP (dBm) and SINR (dB) inside iPhone Field Test Mode (*3001#12345#*)?+

RSRP (Reference Signal Received Power) is measured in negative decibel-milliwatts (dBm) on a logarithmic scale where every 3 dB increase doubles the signal power: `-44 to -79 dBm` is Excellent (near the cell site), `-80 to -90 dBm` is Good, `-91 to -105 dBm` is Fair, and `-110 dBm or lower` is a cell edge dead-zone. SINR (Signal-to-Interference-plus-Noise Ratio) measures signal clarity: above `+20 dB` enables peak 5G 256-QAM speeds, while below `0 dB` indicates heavy interference.

What does the master reset code ##002# do?+

Dialing `##002#` and pressing Call sends a standard 3GPP GSM/LTE/5G Supplementary Service deactivation command to your carrier's core network, immediately erasing all unconditional (`21`) and conditional (`61`, `62`, `67`) call forwarding rules on your line.

Why do some codes execute automatically while others require pressing the green Call button?+

Codes processed locally by iOS firmware (such as `*#06#` to display hardware IMEI/EID barcodes) trigger the moment the final `#` is typed. Codes that query or modify network-side settings on your carrier's HLR/HSS switch (such as `*3001#12345#*`, `*#21#`, or `##002#`) require pressing the green Call button to transmit the MMI/USSD request over the air.

How do I hide my Caller ID for a single outbound phone call?+

In North America (NANP carriers like AT&T, Verizon, and T-Mobile), dial `*67` followed immediately by the 10-digit phone number (e.g., `*672125550199`). In Europe, the UK, India, and Australia (GSM standard), prefix the number with `#31#` (e.g., `#31#07700900077`).