Engineering Mode method is a built-in Apps of most Android devices(not all have this). You can get this menu by type the combination code to the dialer of smartphone.
Below is a step by step guide on how to Change or Write IMEI on a Android device. Invalid IMEI could cause the phone to be unable to detect your SIM card's network meaning no calls, internet or USSD code.
You can read more here about Invalid or Null IMEI HERE
How to get Engineering Mode IMEI to a Spreadtrum Android device
1. Dial *#*#83781#*#* to caller
2. Engineer Mode is appear on screen sometimes after input this code user mush wait 3-5 seconds to show. But if not appear. your smartphones is not supported.
3. In Engineer Mode (Under Telephony), select Set IMEI.
4. Enter 15 digits IMEI of your phone to SIM1 and SIM2.
5. Select OK when prompted to reboot.
How to get Engineering Mode IMEI to a MTK Mediatek Android device.
1. Go to phone dialpad and dial *#*#3646633#*#*
2. Goto connectivity and find CDS info
3. Click on Radio info and click SIM1 or SIM2
4. Then type on command AT+E
5. Select AT+EGMR=1,7" "
6. Type your 15 digit IMEI ex.( AT+EGMR=1,7,"123456789012345" ).
7. press AT command button and reboot phone.
How to get Engineering Mode to a Qualcomm Android device.
To enter General test mode: *#0*#
To show Phone Utility: *#7284#
To self test each component of your phone.: *#7353#
To enable disable long press shutdown: *#7594#
To do Audio, packet, loopback test: *#0283#
To do Real Time Clock Test: *#0782#
To do Vibration test: *#0842#
To show WLAN MAC address and PS mode: *#232338#To reset total call time: *#22558463#
To Show HW Version *#2222#
To Show Camera Firmware settings *#34971539#
To Show Sysdump, log files: *#9900#
To Show Battery Diagnostics: *#0228#
To Show Function testing: *#7353#
To Show Service Mode Menu: *#197328640# or *#0011#
To Show Camera Firmware Menu: *#34971539#
To unlock PUK code (Execute from Emergency dial screen): **05***#
To View Software, PDA, CSC, MODEM Versions: *#1234#
To enter ServiceMode: *#0011#
To show Battery status: *#0228#
To show Touchscreen firmware version: *#2663#
For Alcatel Fixi Qualcomm
Connect your phone to PC with USB cable.
Wait up to 30 seconds while the diagnostic port appears (your phone will be in charging mode).
If diagnostic port is not detected, power the phone ON and activate it by dialing ##2324#. Then select diag port in the ports tab. Diagnostic mode activation: dial *#2618# or ###2324#
For SAMSUNG MOBILE DEVICES
How to get engineering mode Exynos Chipset on Samsung phone.
(Note: Be sure you already oem unlock and google account was remove or any security features are OFF before doing it. All user data will be erase after applying with reboot.)
1. Dial *#272*imei# . imei is your 15 digit imei of your device.
2. Select your Region. Example "XTC" and install and select full customized and the phone will reboot.
3. Dial *#0808# select (ADB) select the last selection from code then apply reboot.
4. Your exynos device now is ready to change or do anything the softwares firmwares. all security was disable
Old platform model like low end keypad Samsung Phones To reset try this code at dialer *2767*3855#.
How to get engineering mode or Hidden menu on LG phone.
In Dialer. TYPE this code 3845#* "your phone model" #
Example: LG G PRO E988 model = 3845#*988#
*#546368#* is another code if 3845#* doesn"t work.
Ex. *#546368#*your phone model# = *#546368#*860# is for model LG G5 h860.
For LG G2 version. Dial 3845#*802# Hidden menu appear. Select WCDMA Only and Tap to Modem Settings then Engineering Mode.
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