Security codes on Motorola GSM phones:
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The PHONE is protected by 2 codes:

1)	The UNLOCK CODE wich consists of 4 digits (default 1234)

	This is changed by typing MENU 51 and providing the security code
	You can type in wrong codes until you hit the right one ! 
	The Unlock code is kept in the 8K EEPROM at address 0372h-0373h : 1234 = 21 43 etc.

2)	The SECURITY CODE wich consists of 6 digits (default 000000)

	This is changed by typing MENU 54 and providing the old code.  Again, you can 
	keep hitting bogus codes all day until you get the right one (hope you got 
	some time to kill).

	Using a Motorola TEST SIM card - it is possible to view and change
	the security and lock code without knowing it. The following commands are used:

	58# Display Security code
	58xxxxxx# Change security code
	59# Display lock code
	59xxxx# Change lock code


Most SIM CARD is protected by 2 codes (newer ones have 3):

1)	The PIN code wich consists of 4 to 8 digits

	The PIN code can only be typed in wrong 3 times. After this the SIM card will be blocked 
	until the PUK code is used. The PIN code is user definable - it can be changed by providing 
	the old PIN code or the PUK code. There is a menu for changing the PIN code by providing the 
	old one, but you can also type **04* in order to do so. To enter a whole new PIN on a blocked
	card or without knowing the old PIN you need to use **05* PUK (OK) NEWPIN (OK) NEWPIN (OK)  

	Newer phase 2 cards has a PIN2 and PUK2 which is used for phase features such as Advice on 
	charge (AOC) this is changed and unblocked accordingly, just using 042 instead of 04 and 052
	instead of 05. 

	Most Motorola phones does not support these phase 2 features and older motorola phones are
	known to have a defect that will give trouble in a phase 2 network.


2)	The PUK code consists of 8 digits

	This is set by the network provider and can not be changed. If entered wrongly 10 times 
	the card will become PERMANENTLY BLOCKED and will need to be replaced !!!


	PUK = Personal Unblocking Key
	PIN = Personal Identification Number

PUK and PIN codes are old terms. ETSI reccomants the use of CHV (card holder verification)
 
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