Being a loyal samsung fan i collected a lot of facts about samsung phones.Lemme share it wth u!.
Some samsung codes(may not work with some models)

**if 9998 doesnt wrk for u then try 8999

*#0228# -Battery %
*#87927#- Wap
*#87927#-Setup mms
*#9999# -for your firmware version
*#9998*bat# for battery
*#9998*vib# vibrator
*#9998*0000#
*#9998*9999#
Now some e700/715 codes…may work in other phones..try it…but be carefull…it can cause real HARM!!!Du at ur own risk!
*#8999*8378# [All in one Code]
*#4777*8665# [GPSR Tool]
*#8999*523# [LCD Brightness]
*#8999*3825523# [External Display]
*#8999*377# [Errors]
#*5737425# [JAVA Something{I choose 2 and it chrashed}]
*#2255# [Call List]
*#7465625# [Sim Lock Test?]
*#8999*8376263# [Phone Info]
#*6420# [Mic Off]
#*6421# [Mic On]
#*6422# [Mic Data?]
#*6428# [Mic Measurement]
#*536961# [Java Status Code]
#*536962# [Java Status Code]
#*536963# [Java Status Code]
#*53696# [Java Status Code]
#*5663351# [Phone Model]
#*5663352# [Java Model]
#*566335# [WAP Model ID]
Plus there are these RESET codes DO NOT USE IF YOU DO NOT WANT TO DELETE SOME INFO FROM YOUR PHONE If someone knows (or wants to test) all of these codes and write what they do it would be great.
*2767*66335#
*2767*3700#
*2767*7100#
*2767*8200#
*2767*7300#
*2767*2877368#
*2767*33927#
*2767*85927#
*2767*48927#
*2767*37927#
*2767*28927#
*2767*65927#
*2767*29927#
*2767*78927#
*2767*77927#
*2767*79927#
*2767*82927#
*2767*787927#
*2767*73738927#
*2767*33667#
*2767*85667#
*2767*48667#
*2767*37667#
*2767*28667#
BE CAREFUL WITH THE ABOVE CODES! THEIR MEANING IS NOT CERTAIN. I’m not sure, but some of these codes can also delete some info from your phone.
Well……Am tired now…cant type any more… :)More details on next post!!