177+ Free USSD and MMI Codes for Android and iPhone

Unlock hidden features and troubleshoot your mobile device with these powerful USSD and MMI codes. These secret dialer codes give you direct access to system information, testing tools, and carrier services that aren't available through regular settings menus.

What Are USSD Codes?

USSD (Unstructured Supplementary Service Data) codes, often called "quick codes" or "feature codes," are communication protocols that let your phone talk directly with your mobile network operator's computers. They work without an internet connection and provide instant access to services like balance checks, call forwarding, and system diagnostics.

What Are MMI Codes?

MMI (Man-Machine Interface) codes are special commands that start with star/hash (*#) prefixes. You enter them like phone numbers to access various device information and enable or disable specific functions. These codes are particularly useful for testing hardware components and accessing manufacturer-specific features.

What If You Get an "Invalid MMI Code" Error?

If you see an "Invalid MMI code" error, don't worry - it's usually fixable. This typically happens when you enter a code your device doesn't recognize or when there's a network connection issue. First, double-check that you've entered the code correctly and ensure your phone has a stable network signal. Some codes may be restricted by your carrier or specific to certain device models.

Android USSD Codes: Complete MMI Code List

Samsung USSD Codes (Restart)

#*2562#
#*3849#
#*3851#
#*3876#

Android System Control USSD Codes

*#7284# - USB I2C Mode Controlling Panel
*#872564# - USB Logging Control
*#4238378# - GCF Configuration Control
*#0283# - Audio Loopback Control
*#1575# - GPS Menu Management

Android Phone Information USSD Codes

##4636## - Phone Information and Usage Statistics
##49862650468##* - PDA, H/W, RFCallDate Details
##1234## - PDA Type and Version
##1111## - Firmware Software Version
##2222## - Firmware Hardware Version
##44336## - Build Version, Sales Code, Build Time
#272IMEI# - Change Sales Codes and Reset User Data
*#0011# - GSM Network Status Information
#12580369# - Software and Hardware Information
#*#8377466# - Software and Hardware Version Information

Android Testing USSD Code List

*#0589# - Light Sensor Test Mode
*#0588# - Proximity Sensor Test
##526## - WLAN Network Access
##232338## - Display WiFi MAC Addresses
##1472365## - GPS Testing
##1575## - Additional GPS Testing
##232331## - Bluetooth Troubleshooting
*#9090# - Diagnostic Configuration
#*3888# - Bluetooth Test Mode
##0## - LCD Screen Testing
##0673## - Melody and Audio Test
##0842## - General Test Mode (Vibration and Backlight)
##2663## - LCD Touch Screen Test
#89998378# - Universal Test Menu
*#0842# - Vibration Motor Test Mode
*#0782# - Real-time Clock Test
*#0673# - Audible Test
#0# - General Test Mode Function

Android Firmware and Service Mode USSD Codes

*#32489# - Service Mode (Ciphering Info)
*#197328640# - Default Service Mode
#0808# - USB Service
*#9090# - Service Mode USB
*#2663# - TSP/TSK Firmware Update
*#34971539# - Camera Firmware Update
*#526# - WLAN Engineering Service Mode
*#528# - WLAN Engineering Service Mode
*#7412365# - Camera Firmware Menu
*#8736364# - OTA Updates Menu
27674387264636# - Sellout SMS/PCODE View

Android Codes for Factory Reset

*#7780# - Factory Reset with Confirmation Message
27673855# - Full Factory Reset Without Confirmation (Hard Reset)
##273283255663282##* - File Copy and Media Backup

Android USSD Codes for Debugging

*#745# - Dump Menu for RIL
*#746# - General Debug Dump Menu
*#9900# - System Dump Menu (Network Speed, WiFi, Battery Boost)
*#03# - NAND Flash S/N
*#7594# - Remap Shutdown to End Call TSK
*#272886# - Auto Answer Selection

iPhone USSD Codes: Complete MMI Code List

iPhone IMEI USSD Code

*#06# - Display Phone's IMEI Number

iPhone Field Mode Secret Code

3001#12345# - Open Field Mode with Internal Settings and Network Information

iPhone Call Forwarding Codes

*#67# - Check Call Forwarding Number
*#21# - View All Call Forwarding Settings
##002# - Disable All Call Forwarding

iPhone Account and Usage Codes

*646# - Check Available Minutes (Postpaid)
*225# - Check Bill Balance (Postpaid)
*777# - Check Account Balance (Prepaid)
*3282# - Get Usage Information Details

iPhone Configuration and Service Codes

*#33# - Check Call, SMS, and Data Configurations
*#76# - Check Connected Line Presentation Status
*#61# - Check Missed Calls
*#62# - Verify Call Forwarding Number in No Service Mode
*#30# - Block or Allow Phone Numbers

iPhone Call Management Codes

*#43# - Check Call Waiting Status
*43# - Activate Call Waiting
#43# - Deactivate Call Waiting
*#31# - Hide Your Phone Number

iPhone Enhanced Features

*3370# - Enable EFR Mode (Enhanced Full Rate)
#3370# - Disable EFR Mode
#50057672# - Check SMS Center
331 - Bar Outgoing Calls

Generic Android USSD Codes

##0842## - Test Vibration and Backlight
##7780## - Battery History and Usage Statistics
##232331## - Bluetooth Testing
##49862650468##* - PDA, Phone, H/W Information
##0283## - Packet Loopback Information
##0##* - LCD Information
##1234## - PDA and Phone Information (HTC)
##1111## - FTA SW Version Information
##2222## - FTA HW Version
##232337#*# - Bluetooth Device Address
##1472365## - GPRS Testing
##1575## - Additional GPRS Testing
##44336## - Full PDA, Phone, CSC Information
##0588## - Proximity Sensor Test
##0673## OR ##0289## - Melody Test
##3264## - RAM Information
##2663## - Screen Version Information
##2664## - Touch Screen Test
##232338## - WiFi MAC Address
##3424##* - HTC Function Test Menu
27673855# - HTC Hard Reset

Remember that not all codes work on every device or with every carrier. Some manufacturers and network providers restrict certain codes for security or technical reasons. Always back up your data before using factory reset codes, and use these tools responsibly to explore your device's hidden capabilities.