After watching HAVE THE POLICE TAPPED YOUR PHONE? VIDEO I wanted to comprehend what this actually means. I followed the instructions *#21# call and what came up on my phone was CARRIER MESSAGE call forwarding, Voice not forwarding.
MMI CODES
Every code that you enter over your phones keypad that contains asterisk (*) or hash (#) characters is an MMI code. MMI stands for Man-Machine-Interface.
Even though most of these MMI codes look pretty similar, they fall into different groups with completely different actions. Some are just used locally on the device, some are sent to the SIM, others are sent to the network.
DIFFERENT KINDS OF MMI CODES
Supplementary Service (SS) codes
Those are the codes used to control, for example, call forwarding or number presentation. With *21*123456789# <SEND> you would instruct your phone to ask the network to forward all your incoming calls to the number 123456789. But this code is not sent directly to the network. Instead, it is parsed by the phone which then constructs an ASN.1 coded request to the network. These codes are hardcoded into every GSM/UMTS/LTE device worldwide and cannot be changed by your network operator.
Unstructured Supplementary Service Data (USSD) codes
If you enter a code that at least ends in a hash sign (and press <SEND>) and is not recognized by the phones MMI parser, the code will be sent to the network verbatim. It then depends on the network if this code is supported. One of the most used cases is a code for prepaid cards to check your balance. Many networks use something like *#100#. But it is really the choice of the network operator which code to use as long as it not already taken.
So entering *20*1234# <SEND> or *21*1234# <SEND> would do two completely different things: The first code would be sent as-is to the network for further processing (most likely returning an error), while the second code would be parsed by the phone and a structured request for activation of call forwarding would be sent to the network.
Please note: For SS and USSD codes you always need to press the <SEND> key after entering them, so it is not possible to automatically execute those codes with a tel-URL.
Manufacturer defined MMI codes
This is the category into which the much talked-about Samsung code falls.
Codes specific to your phone model that have been built in by the manufacturer to, for example, activate service menus or reset the device. These codes also contain * and # characters. Since the codes are not being sent to the network, you don’t have to press the <SEND> key at the end – they are executed as soon as the last digit or character has been entered. There is one code that is mandatory for all manufacturers of GSM/UMTS/LTE phones to implement:*#06#
It shows the devices IMEI (Internatiol Mobile Equipment Identifier)
SIM control codes
These codes are used, for example, to change your SIMs PIN code.
**04*1234*6789*6789# would change your PIN code from “1234” to “6789”.
These codes are also executed without pressing the <SEND> key.
The complete specification for the MMI interface of GSM/UMTS/LTE devices can be found in 3GPP TS 22.030: “Man-Machine Interface (MMI) of the User Equipment (UE)”
Source: https://berlin.ccc.de/~tobias/mmi-ussd-ss-codes-explained.html
IN CONCLUSION
I would suggest that my phone messages are being forwarded to a third party.
LIST OF MMI CODES
*#44336# Software Version Info
*#1234# View SW Version PDA, CSC, MODEM
*#12580*369# SW & HW Info
*#197328640# Service Mode
*#06# = IMEI Number.
*#1234# = Firmware Version.
*#2222# = H/W Version.
*#8999*8376263# = All Versions Together.
*#272*imei#* Product code
*#*#3264#*#*- RAM version
*#92782# = Phone Model
*#*#9999#*#*= Phone/pda/csc info
Testing
*#07# Test History
*#232339# WLAN Test Mode
*#232331# Bluetooth Test Mode
*#*#232331#*#*- Bluetooth test
*#0842# Vibration Motor Test Mode
*#0782# Real Time Clock Test
*#0228# ADC Reading
*#32489# (Ciphering Info)
*#232337# Bluetooth Address
*#0673# Audio Test Mode
*#0*# General Test Mode
*#3214789650# LBS Test Mode
*#0289# Melody Test Mode
*#0589# Light Sensor Test Mode
*#0588# Proximity Sensor Test Mode
*#7353# Quick Test Menu
*#8999*8378# = Test Menu.
*#*#0588#*#*- Proximity sensor test
*#*#2664#*#*- Touch screen test
*#*#0842#*#*- Vibration test*
Network
*7465625*638*# Configure Network Lock MCC/MNC
#7465625*638*# Insert Network Lock Keycode
*7465625*782*# Configure Network Lock NSP
#7465625*782*# Insert Partitial Network Lock Keycode
*7465625*77*# Insert Network Lock Keycode SP
#7465625*77*# Insert Operator Lock Keycode
*7465625*27*# Insert Network Lock Keycode NSP/CP
#7465625*27*# Insert Content Provider Keycode
*#7465625# View Phone Lock Status
*#232338# WLAN MAC Address
*#526# WLAN Engineering Mode -runs wlan tests (same as below)
*#528# WLAN Engineering Mode
*#2263# RF Band Selection-not sure about this one appears to be locked
*#301279# HSDPA/HSUPA Control Menu—change HSDPA classes (opt. 1-5)
Tools/Misc.
*#*#1111#*#*- Service Mode
#273283*255*663282*# Data Create SD Card
*#4777*8665# = GPSR Tool.
*#4238378# GCF Configuration
*#1575# GPS Control Menu
*#9090# Diagnostic Configuration
*#7284# USB I2C Mode Control—mount to usb for storage/modem
*#872564# USB Logging Control
*#9900# System dump mode- can dump logs for debugging
*#34971539# Camera Firmware Update
*#7412365# Camera Firmware Menu
*#273283*255*3282*# Data Create Menu- change sms, mms, voice, contact limits
*2767*4387264636# Sellout SMS / PCODE view
*#3282*727336*# Data Usage Status
*#*#8255#*#*- Show GTalk service monitor-great source of info
*#3214789# GCF Mode Status
*#0283# Audio Loopback Control
#7594# Remap Shutdown to End Call TSK
*#272886# Auto Answer Selection
****SYSTEM***
USE CAUTION
*#7780# Factory Reset
*2767*3855# Full Factory Reset
*#*#7780#*#* Factory data reset
*#745# RIL Dump Menu
*#746# Debug Dump Menu
*#9900# System Dump Mode
*#8736364# OTA Update Menu
*#2663# TSP / TSK firmware update
*#03# NAND Flash S/N
Source: https://forum.xda-developers.com/t/ref-list-of-ussd-codes-updated-10-30.1953506/https://forum.xda-developers.com/t/ref-list-of-ussd-codes-updated-10-30.1953506/
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