Motorola Secret Codes

IMEI number:
*#06#
Code to lock keys. Press together *7
Note: [] (pause) means the * key held in
until box appears.
Select phone line - (use this to write
things below the provider name):
[] [] [] 0 0 8 [] 1 []
Add phonebook to main menu:
[] [] [] 1 0 5 [] 1 []
Add messages to main menu:
[] [] [] 1 0 7 [] 1 []
Copy SIM memory (phonebook menu):
[] [] [] 1 0 8 [] 1 []
Eng Field options (main menu):
[] [] [] 1 1 3 [] 1 []
Slow (Frequency of search menu):
[] [] [] 1 0 1 [] 1 []
Medium (Frequency of search menu):
[] [] [] 1 0 2 [] 1 []
Fast (Frequency of search menu):
[] [] [] 1 0 3 [] 1 []
Enable EFR:
[] [] [] 1 1 9 [] 1 []
Function :
[] [] [] # # # [] 1 []
Change pin:
[] [] [] 0 0 4 [] 1 []
Unblocking using the "puk" number:
[] [] [] 0 0 5 [] 1 []
There are lots of similar codes exist. If you
change the last number to 0 you can
deactive that code. The 3 digit number at
the middle are from 0 to 999. I put the
most interesting codes. (EFR):Enhanced
Full Rate Codec.
You can change GSM frequencies to
900/1800 by entering the enginnering
model. Following the below steps:
enter menu and press 048263* quickly,
then you will enter the secret engineering
menu
under "Opcode"
input 10*0*3 for GSM 900
10*0*4 for GSM 1800
10*0*5 for GSM 1900
10*0*6 for dual band GSM 900/1800
10*0*7 for dual band GSM 850/1900
To add extra message space 4 your
Motorola C350 C450 C550 or C650,
press menu button, press 048263*
quickly, then on the popup menu enter 47
press ok.press 50 and ok.press 1
ok.press 64 ok.press 1 ok.press 186 and
ok.You will receive an extra 50 msgs
memory space.Switch phone off and back
on.(not tested)