MOTOROLA SECREET CODE

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. Input the most interesting codes. (EFR):Enhanced Full Rate Codec. You can change GSM frequencie 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