*#66*# Set Factory Mode CONFIRMED
*#8375# Show Software Version CONFIRMED
*#1234# A2DP ACP Mode CONFIRMED
*#1234# A2DP INT Mode CONFIRMED
*#0000# + Send : Set Default Language CONFIRMED
*#0007# + Send : Set Language to Russian CONFIRMED
*#0033# + Send : Set Language to French CONFIRMED
*#0034# + Send : Set Language to Spanish CONFIRMED
*#0039# + Send : Set Language to Italian CONFIRMED
*#0044# + Send : Set Language to English CONFIRMED
*#0049# + Send : Set Language to German CONFIRMED
*#0066# + Send : Set Language to Thai CONFIRMED
*#0084# + Send : Set Language to Vietnamese CONFIRMED
*#0966# + Send : Set Language to Arabic CONFIRMED
*#800# make Etel E10 model displaying message BT power on. But on display it dont resemble the blutooth power on icon.(actually t makes BT stuck, but after restarting t becomes normal <tested by me>)

More codes to reset chinese mobile phone
*#77218114#
*#881188#
*#94267357#
*#9426*357#
*#19912006#
*#118811#
*#3646633#

also found these

Service codes Konka:
C926 software version: *320# Send
C926 set default language: *#0000# Send
C926 set English language: *#0044# Send

Service codes GStar:
GM208 (Chinese Nokea 6230+) engineering menu: *#66*#
Set language to English: *#0044#
Set language to Russian: *#0007#

ZTE Mobile:>1- *938*737381#
2- PHONE WILL DIPLAYED DONE
3- POWER OFF YOUR PHONE AND POWER ON AGAIN
alcatel:>E205
unlocking phone code,only press***847# without simcard
E900 software version: *#5002*8376263#
E900 full reset: *2767*3855#

Service codes Spice:
S404 enable COM port: *#42253646633# -> Device -> Set UART -> PS -> UART1/115200
S410 engineer mode: *#3646633#
S900 software version: *#8375#
S900 serial no: *#33778#

Service codes Philips: 
S200 enable COM port: *#3338913# -> Device -> Set UART -> PS -> UART1/115200

Service codes "Chinese" models:
default user code: 1122, 3344, 1234, 5678
Engineer mode: *#110*01#
Factory mode: *#987#
Enable COM port: *#110*01# -> Device -> Set UART -> PS Config -> UART1/115200
Restore factory settings: *#987*99#
LCD contrast: *#369#
software version: *#800#
software version: *#900#

Service codes BenQ: 
software version: *#300#
test mode: *#302*20040615#

Service codes Pantech:
software version: *01763*79837#
service menu: *01763*476#
reset defaults (phone/user code reset to default): *01763*737381#

Service codes VK-Mobile **x, 5xx:
software version: *#79#
software version: *#837#
service menu: *#85*364# (hold #)

Service codes VK200, VK2000, VK2010, VK2020, VK4000: 
software version: *#79#
service menu: *#9998*8336# (hold #)
reset defaults (phone/user code reset to default): *#9998*7328# (hold #)

Service codes LG:
software version: 2945#*#
KG300 NVRAM format: 2945#*# -> menu 15

Service codes Sony-Ericsson:
J100 software version: #82#

Service codes Fly:
M100 software version: ####0000#
2040(i) reset defaults: *#987*99# Send
MX200 reset defaults: *#987*99# Send
MX200 software version: *#900# Send
SL300m reset defaults: *#987*99# Send
SL300m software version: *#900# Send
SL500m reset defaults: *#987*99# Send
SL500m software version: *#900# Send
MP500 reset defaults: *#987*99# Send
MP500 software version: *#900# Send
Set language to English: *#0044#
Set language to Russian: *#0007#

Service codes Konka:
C926 software version: *320# Send
C926 set default language: *#0000# Send
C926 set English language: *#0044# Send

Service codes GStar:
GM208 (Chinese Nokea 6230+) engineering menu: *#66*#
Set language to English: *#0044#
Set language to Russian: *#0007#

Service codes Motofone-F3:
Motofone F3 software version: **9999* Send
***300* Set SIM Pin
***310* / ***311* SIM Pin ON | OFF
***000* Reset Factory settings
***644* Set Voicemail number
***260* / ***261* Auto keypad lock ON | OFF
***510* / ***511* Voice Prompts ON | OFF
***160* / ***161* Restricted Calling (Phonebook only) ON | OFF
***200608* Send: software version
***200606* Send: software version
***200806* Send: flex version
***250* / ***251* Keypad tones ON | OFF
***470* Select time format
***500* /***501* Prepaid Balance Display ON | OFF
***520* Change language

Service codes Motorola:
C113, C114, C115, C115i, C116, C117, C118 software version: #02#*
C138, C139, C140 software version: #02#*
C155, C156, C157 software version: #02#*
C257, C261 software version: #02#*
V171, V172, V173 software version: #02#*
V175, V176, V176 software version: #02#*
C168, W220 software version: *#**837#
W208, W375 software version: #02#*
and "yes"''

I-mobile Inno30, 55, 89, 90, 99, 100, A10, A20, P10, Vk200
- Set full factory *741*737381#
- Set full factory *741*7373868#
- Set full factory *741*2878#
- Set Engineer Mode *888*888#
- Check software version *888*837#

I-mobile 100 ,200 , 313
- Check software version #*888#

I-mobile 309, 310
- Check software version *0*4636#
- Test Mode *0*6268#

I-mobile 311
- Check software version #*878#

I-mobile 511
- Check software version *1222*1#

I-mobile 301, 302,308, 508, 601, 602, 603, 604, 606, 611, 901, 902
- Check software version *#159#
- Set Factory Mode *#32787#
- Set Engineer Mode *#3646633#

I-mobile 503, 506, 605, 600, 607, 608
- Set Engineer Mode ***503#
- Set Factory Mode ***504#
- Set Auto Test ***505#

I-mobile 509, 612
- Set Factory Mode *#66*#

I-mobile 504, 505, 803
- Check software version *68*48#
- Set full factory *789#
- Test Mode *#789#

I-mobile 305, 306, 315, 510, 609, 609i,516
- Check software version *#8375#
- Set Factory Mode 878

I-mobile 610
- Check software version *#22#

I-mobile J101, J102
- Test Mode *23638777*783781#

I-mobile 502, 502i, 505, k9, 802 
- Check software version *201206*4636#