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How to enable Diag mode for ZTE smartphones

First of all you need enable Hidden menu


*ZTE*OPENEM# (*983*673636#) -- this action will be confirmed by a quick pop-up.

Diag mode - *983*87274#

To close this mode, dial *ZTE*CLOSEEM# (*983*2567336#) -- this then prompts whether you want to do a Factory Reset, which you do not have to do (you can simply Back away from this screen).

Some other codes
 

*983*0# Menu (20:Battery/OLED/Back Light/Vibrator/Ringer/LED/Key/OLED off/SD/BT address/Radio Info/Memory/TouchPaint Test/Audio Loop/FM/Camera/GPS Test/IMEI/IMSI)

 

*983*3640*01# IMSI

*983*25# Battery Info[/COLOR]

*983*31# OLED Test

*983*26# Backlight Test

*983*850# Radio Test 0

*983*86# Vibrator & LED Test

*983*84# Ringer Test

*983*07*01# Headset Test

*983*07*02# Key Test

*983*3470# LCD Test

*983*81# SD Test

*983*890# -

*983*26*# Radio Test 1

*#06# IMEI

*983*27274# CRASH Reboot

*#08# Test Flag [Note: requires QcNvTest.apk in /system/app]

*#09***# BT Test

*983*1275# _ASK Dev Info

*983*7# Menu (4:Version/IMEI/IMSI/BT address)

*983*3640# DOH+ Phone Info (inc ping test, radio on/off)

*983*636# MEM Memory Test

*983*28# BT Emode BT Test

*983*477# GPS GPS Test

*983*21# Audio Loop Test

*983*70# Automatic Inspection

*#18# LED Test

*#19# TouchPaint Test

*983*36# FM FM Test

*983*57# Factory Reset

*983*473# Camera

*#23# Video Camera

*983*10# Delete (Touchscreeen) Calibration File

*#25# FM Test

*983*2726# SIM Contacts Op 1

*983*37# SIM Contacts Op 2

*983*6726# SIM Contacts Op 3

*983*154# "test" Menu (12:Self-starting/Software

Version/Hardware Version/PSN/Test Flag/[Completed]/Board Serial/Bluetooth
Address/SMS security/SMS Registration Status/Flash Type/PRL Version/Serial Configuration)
*983*07# Menu (9:OLED/Ringer/Vibrator/Key Test/Audio Loop/Headset Test/FM/Camera/SD)

*983*5182# Dev Info

*983*7469# SHOW Automatic Inspection

*#26***# Sensor Test

*983*7936# QXDM Save Qxdm in log system

*987*0# Menu (4:Produce Information[->"test" Menu]/Automatic Inspection/Factory data reset/Battery information)

*#27***# Compass Test

*983*87274# USBSI USB Switch Test

*983*06# BT Test

*983*564738# LOGSET LOG Set (inc sys_rw)

*983*93# FCC Test [Note: requires fcctest.apk in /system/app]

*983*2377# CFQP Call Forwarding Query with PowerOn

*983*24474636# CHIPINFO Chiper Test (chip info) [Note: requires

ChiperTest.apk in /system/app]

*983*29873283# AXUPDATE Touchscreen Updater

*983*73564# SDLOG SD Log


Note: the above are for the standard ROM (well, apps) running 2.1. The current Froyo ROM (with standard dialler, etc.) does not have the Touchscreen Updater, but adds:

Dial Operation
*987*123456# DM Test