Found this on another forum...
Try ##3282# to access the EPST menu....you will still need your MSL or OTSKL code to edit any of the options.
Also found this... (don't know if any or all of these work for your phone, but some look interesting).
[h=1]Samsung Galaxy W Secret Code[/h]General Test Mode : *#0*#
Quick Test Menu : *#7353#
Service Mode : *#197328640#
TSP / TSK firmware update : *#2663#
OTA Update Menu : *#8736364#
Product code : *#272*imei#*
Sofware Version Info : *#44336#
SW & HW Info : *#12580*369#
Ciphering Info : *#32489#
NAND Flash S/N : *#03#
View Phone Lock Status : *#7465625#
View SW Version PDA, CSC, MODEM : *#1234#
Sellout SMS / PCODE view : *2767*4387264636#
LBS Test Mode : *#3214789650#
Light Sensor Test Mode : *#0589#
Audio Test Mode : *#0673#
Bluetooth Test Mode : *#232331#
WLAN Test Mode : *#232339#
Melody Test Mode : *#0289#
Real Time Clock Test : *#0782#
Proximity Sensor Test Mode : *#0588#
Vibra Motor Test Mode : *#0842#
Test History : *#07#
Diagnostic ConfiguratioN : *#9090#
GCF Configuration : *#4238378#
GCF Mode Status : *#3214789#
GPS Control Menu : *#1575#
Audio Loopback Control : *#0283#
Camera Firmware Menu : *#7412365#
Camera Firmware Update : *#34971539#
Bluetooth Address : *#232337#
RF Band Selection : *#2263#
WLAN Engineering Mode : *#526#
WLAN Engineering Mode : *#528#
WLAN MAC Address : *#232338#
Configure Network Lock MCC/MNC : *7465625*638*#
Configure Network Lock NSP : *7465625*782*#
HSDPA/HSUPA Control Menu : *#301279#
Insert Content Provider Keycode : #7465625*27*#
Insert Network Lock Keycode : #7465625*638*#
Insert Network Lock Keycode NSP/CP : *7465625*27*#
Insert Network Lock Keycode SP : *7465625*77*#
Insert Operator Lock Keycode : #7465625*77*#
Insert Partitial Network Lock Keycode : #7465625*782*#
Debug Dump Menu : *#746#
RIL Dump Menu : *#745#
System Dump Mode : *#9900#
Data Create Menu : *#273283*255*3282*#
Data Create SD Card : *#273283*255*663282*#
Data Usage Status : *#3282*727336*#
ADC Reading : *#0228#
Auto Answer Selection : *#272886#
Remap Shutdown to End Call TSK : *#7594#
USB I2C Mode Control : *#7284#
USB Logging Control : *#872564#
Factory Reset : *#7780#
Full Factory Reset : *2767*3855#
Unknown : *#80#
And... I think these only work on HTC phones
##775# - EPST/PRL - PRL Settings
##786# - EPST - Status Menu
##3282# - EPST - Data Programming Menu (User Name, Advanced, Restore, Enable HFA, DSA Server, MMSC URL)
##33284# - Debug - Debug Menu – (Debug Screen, Test Calls, RC Data, HDR/1X Selection, Voice Privacy, DTMF Set, Korea Mode Set)
##3424# - Diagnostic - Connect to phone in diag mode
##2539# - EPST/A-Key - Data A key menu
##7738# - EPST/P_Rev - Protocol Revision
##8626337# - EPST/Vocoder - Unsure
##4772579# - Reset the GPS
##72786# - changes DSA back to Factory
##889# - enables TTY
*#*#4636#*#* - Phone Information - "Phone information, Battery information, Battery history, Useage statistics, Wifi information"
##UPST# - modem directory
##778# - EPST - Advanced Programming
##37872# - Full Speed USB Mode - Enable/Disable
##3386# - DDTM - Enable/Disable
*#0*# - Test Utility - SAFE TO PLAY WITH
*#0011# Service menu
*#0228# Battery Status
*#0283# Receiver Packet loopback
*#0289# Melody Test again?
*#0673# Melody Test SAFE TO PLAY WITH
*#0782# RTCTimeRead displays time (and seconds)
*#0842# Vibration test SAFE TO PLAY WITH
*#147852# Allows you to access many screens including CDMA DATA Connections
*#1472365# GPS Setup
*#1575# Service menu
*#197328640# Service menu
*#2263# ??
*#232331# Bluetooth RF Test Mode
*#2454# Low Battery Power Off
*#2580# Service menu
*#2663# Touchscreen Accuracy Test SAFE TO PLAY WITH
*#2664# Touchscreen Firmware Version
*#2664# Main Firmware Update
*#2767*2878# Service menu
*#32489# Service menu
*#3264# RAM Version
*#3282*727336*# Current Data State
*#369852# Allows you to access many screens including CDMA DATA Connections
*#4238378# Service menu
*#6984125*# Service menu
*#7284# Service menu
*#745# Sec_RIL_Dump allows you to copy to phone memory, clear ril log, (greyed out copy to SDcard and view RIL log), exit
*#7450# Phone Dump Mode Disable
*#7451# Phone Dump Mode Enable
*#767*3855# Factory Format – CRAP!! WARNING!!!
*#7780# Factory Reset
*#9090# Service menu
*#9900# SysDump copy logcat/dumpstate/dumpsys, enable debug log, copy watchdogdumpstatelog)
Finally, found this little diddy...
[video=youtube;RZxi0MWU72E]http://www.youtube.com/watch?v=RZxi0MWU72E[/video]
