Saw some people on here asking for diagnostic code a while back, no such luck, but here's the list of codes according to the firmware. No idea what these do, just decided to poke around...
PartnerImmediateDialStrings:
##634#
##4678255#
*#07#
##07#
PartnerNonImmediateDialStrings:
##3282
##2539#
##33284#
##2539
##786
##778
##33284
HomeNetworkSpecificDialStrings:
*71
*72
*73
PersoUnlockCode:
##782#
PartnerImmediateDialStrings:
##634#
##4678255#
*#07#
##07#
PartnerNonImmediateDialStrings:
##3282
##2539#
##33284#
##2539
##786
##778
##33284
HomeNetworkSpecificDialStrings:
*71
*72
*73
PersoUnlockCode:
##782#