*3001#12345# Test Mode - Also make security codes completely useless, since it prints it out in this mode.
*#92772689#
*#warranty# 		Personal Information download, as well as ESN, Manufacture Date, Repair Date, and Lifetime Clock
*#3872#
*#evrc# 		"Enhanced Variable Rate Codec" - some people report longer battery life in analog mode... though I'm not quite sure that makes sense.
*22801 May force your phone into 800MHz digital service... doesn't do anything on my phone...
*#837#
*#ver# 		The version number of your phone
*#639n#
*#new[n]#
  • reprograms the phone... but you'll need a service code...
  • [n] seems to be optional and programs a particular nam
  • The Code is stored on your phones Atmel 24C512 in address locations 8C through 91 (6 ASCII characters).
  • Bell Atlantic Mobile: 00022
EEPROM Atmel 24C256. Offsets:
ESN: 0x52 - 0x55
SPLock code:0x8c-0x91
NAM1 Alpha Tag:0x364c
NAM2 Phone#:0x37bc-0x37c0
NAM2 Alpha Tag:0x37cc
Emerg. #1:0x3c80
Emerg. #2:0x3c88
Sec. Code:0x3fc8
Lock Code:0x3fce
Life Timer: 0x404d - 0x404e
Phone book entries: ~0x4d30
NAM entry string:0x6baa-0x6bb4 "*3001#12345#" can be changed!
Blank (0xff):0x73a0-0xffff
Bunch of useful tips