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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 []

Their are lots of similar codes existing. 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 to 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)

NOTE: Try these codes at your own risk! We don't accept any complaints.

Some of these codes may not work.

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