These codes work for the c350, c375 ,c450, c550 & c650. I have given only 4 safe codes here.Note down the codes carefully & bookmark this site in case u lose the undo codes. Please enter only the proper numbers to avoid messing up ur phone!

FIRST OF ALL, u must bring up the OPERATOR MENU. To do this, press MENU key, followed quickly by the numbers 048263 and * (STAR) key. Once u get the Opcode menu, u may use any of the following codes:

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