While I was busy beating the dust out of my new SGS2 and tinkering with ROM’s, I came across quite a few “hidden features” that were not known to me.
*#*#4636#*#*
above will give you “test mode” in which you can run things like “ping test” etc. Nice for testing your data connection without actually connecting anywhere 🙂
*#9900#
that looks like debugging screen in which you can manipulate logs etc. for reporting, and “Disable dormancy” for better battery life.
*#1234#
above will produce phone information – very handy for reporting and looking up issues etc.