[ZTE ZMAX Guides, News, & Discussion] skinlab:
*ZTE*OPENEM# (*983*673636#) -- this action will be confirmed by a quick pop-up. 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).

*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:eek:LED/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[emoji14]roduce 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

*983*0#; MULTIPLE TEST

*983*3640*01#; IMSI

*983*25#; BATTERY/GAUGE INFO

*983*31#; DISPLAY TEST

*983*26#; BACKLIGHT TEST

*983*850#; N/W

*983*86#; VIBRA/LED TEST

*983*84#; RINGER TEST

*983*07*01#; HEADSET TEST

*983*07*02#; KEYTEST (VOL+/VOL-)

*983*3470#; DISPLAY GOES BLACK FOR 2 SECS

*983*81#; SD TEST

*983*890#; N/W

*983*26*#; BACKLIGHT TEST

*#06#; IMEI

*983*27274#; POWER OFF (SHUTDOWN), RESTART, EFFECT NOT CONFIRMED

*#08#; TESTFLAG (BOARDSERIAL, TESTFLAG, RESERVED BITS)

*#09***#; BTTEST

*983*1275#; DEVICEINFO, MODEL,FW,BB

*983*7#; VERSION,IMEI,IMSI,BT ADDRESS

*983*3640#; PHONE INFO - INTERESTING

*983*636#; MEMORY TEST RAM/ROM

*983*28#; EMODE BT TEST

*983*477#; GPS TEST

*983*21#; AUDIO LOOP TEST

*983*70#; MULTIPLE TESTS

*#18#; LCD TEST

*#19#; TOUCH/LCD TEST

*983*36#; FM TEST

*983*57#; FACTORY RESET ***************

*983*473#; FRONT CAMERA

*#23#; FRONT CAMERA

*983*10#; N/W

*#25#; FM TEST

*983*2726#; IMPORT CONTACTS

*983*37#; SAME

*983*6726#; SAME

*983*154#; QUERY PRODUCT INFO

*983*07#; TESTS

*983*5182#; DEVICE INFO

*983*7469#; TESTS

*#26***#; SENSOR TEST

*983*7936#; SAVE QXDM IN LOG SYSTEM

*987*0#; MULTI INFO WITH FACTRST

*#27***#; COMPASS TEST

*983*87274#; USB SWITCHING TEST

*983*06#; BT TEST

*983*564738#; LOG

*983*93#; FCCTEST

*983*2377#; CALL FORWARDING QUERY WITH PWRON

*983*24474636#; HW(LCD,TCH,WIFI,BT,CAM,FLASH) INFO

*983*73564#; SDLOG

*987*123456#; N/W

*983*205#; N/W

*#0000#; N/W

*983*1#; N/W

*983*2#; N/W

*983*3#; N/W

*983*8284#; N/W

*983*7668#; N/W

*983*7278466#; N/W

*983*9434622#; WIFI MAC

*983*288384#; NW

*983*288385#; NW

*983*1234#; NW

*983*1233#; NW

*983*7336#; SUCCESS! CURRENT STATE IS ENABLED ?????

*983*7337#; SUCCESS! CURRENT STATE IS FORBIDD ?????

*983*79482436#; NW

*983*72346373#; RF INFO

*983*24736#; NW

*983*24737#; NW

*983*4740#; GPIO

*983*74883696#; TURN OFF SYSTEM

*983*87236#; SUCCESS! CURRENT STATE IS ENABLED ?????

*983*87237#; SUCCESS! CURRENT STATE IS FORBIDD ?????

*983*29873283#; NWZTE