参考:
https://technastic.com/android-secret-codes-ussd-codes/

比较有用的部分

查看手机信号和WIFI信号/信道/RSSI强度

因为很多手机的信号强度只会显示强弱, 不会显示数值, 也不知道信道或者WIFI频率, 下面这个就很有用, 不需要再去找额外的软件. IQOO上可用.
*#*#4636#*#* – Display device information

列表

1. *#06# – Display IMEI Number
2. ##4636## – Display device information
3. ##7780## – Perform a Factory Reset
4. 27673855# – Wipe phone & re-install firmware
5. *#0228# – Check battery status
6. #0# – Hardware test mode
7. *43# – Enable call waiting
8. *#67# – Check call forwarding status
9. *#21# – Check call forwarding status
10. *#62# – Check call forwarding status when not reachable

11. 002# – Erase all call forwarding

12. *31# – Hide Caller ID
13. *#004# – Check call diversion status
14. *#9090# – Open diagnostic configuration screen
15. *#0011# – Service Mode
16. *#2222# – Check Hardware version
17. *#1234# – Check software version (Samsung & OnePlus)
18. #12580369# – Check Software and hardware version
19. *#0283# – Check Audio loopback control
20. *#34971539# – Check Camera firmware
21. *#9900# – Launch System Dump mode
22. *04 – Change Android device PIN
23. Change the PIN of your SIM Card
24. *#07# – Check the Maximum SAR Level of Android Device

Secret Code
Function
#07# Displays the SAR (Specific Absorption Rate) value of the device
##225## Displays calendar data storage information
##426## View Google Play Services diagnostic report
##759## Displays the RLZ Debug UI and Unique Device ID
3282# Receive a text message with your billing information
##372733## Opens up the service mode on Nokia phones
##682## Opens up the offline update tool on Nothing devices
#66# Displays the IMEI and MEID in encrypted format on OnePlus and Realme phones
#888# Displays the PCB version of the motherboard of the phone (OnePlus & Realme)
##2947322243## Wipes out the internal memory on OnePlus phones
#800# Opens up the factory mode on Realme devices
#6776# Displays the software version and other details on Realme devices
##64663## Displays the hardware diagnostic and quality check menu on Xiaomi phones
##86583## Enable VoLTE carrier check (Xiaomi)
##86943## Enable VoWiFi carrier check (Xiaomi)
##726633## Enable/disable 5G SA carrier check (Xiaomi)

778 + call Brings up the EPST menu

##0## LCD test
##0588## Proximity sensor test
##0673## Audio test mode
##0842## Vibration and backlight test
##1111## FTA software version
##1472365## Quick GPS test
##1575## GPS test
##197328640## Enter Service Mode to perform network service tests and change phone settings
##232331## Bluetooth test
##232337## Check the Bluetooth device address
##232338## Wi-Fi Mac address
##232339##
or

##526##

Wireless LAN test
##2663## Check the touchscreen version
##2664## Touch Screen test
##273283255663282##*
or

##273282255663282##*

Backup all the media files stored on your phone
##3264## Check the RAM version
##44336## Displays build time and change list number
##49862650468## Displays PDA, hardware, phone, and RF call date info
##7262626## Field test
##7594## Change the Power button behavior
05# Execute from the Emergency dial screen to unlock the PUK code
##8350## Disables voice dialing logging mode
##8351## Enables voice dialing logging mode
#03# Displays NAND flash serial number
#0589# Light sensor test
#0782# Realtime clock test
#2263# Displays the RF band selection
#7284# USB 12C mode control
#7353# Quick test menu
#746# View the Debug dump menu
#872564# USB logging control
#8736364# OTA update menu
##34971539## View the camera firmware information
3001#12345# Enter Field Mode to get information about available networks and cell towers
#3282727336# Displays storage and data consumption information
##0283## Perform a packet loopback test
##0289## Test the phone’s audio

0782*# Real-time clock test

#745# View the RIL dump menu
#3214789# Check the GCF mode status
#61# Check how long it takes to forward calls
5005*7672# View SMS message center number