It is requiring me to put in a security code before using the phone. We never had to install a security code and have had the phone for two years.

puk is a function of your network provider. call him , he will ask your sim no and tell you the code.

ur defalt phones codes is 12345 or 00000 u can use it
Default 4 Digit user code: 1234 or 0000
Default 6 Digit Security code: 123456 or 000000

IF Problem not Solved So
Please New Software install in the Phone Problem will Solved

Dear Sir/Mam
Regarding your problem please contact your service provider. The PIN code supplied with the SIM card protects the card against unauthorised use. The PIN2 code supplied with some SIM cards is required to access certain services. If you enter PIN or PIN2 code incorrectly three times in succession, you are asked for the PUK or PUK2 code. If you do not have them, contact your service provider. The module PIN is required to access the information in the security module of your SIM card. The signing PIN may be required for the digital signature. The barring password is required when using the call barring service. To set= how your phone uses the access codes and security settings, select Menu> Settings> Security.

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There are several security codes used on cell phones. I'll try to define each:

1) Limited access code: This is a pre-set code that limits the phone's use to dialing or receiving only pre-programmed numbers. For example, an employer gives a company phone to a delivery guy which will only make calls to -and receive calls from - the office.

2) Security codes:

a) Software security unlock code: Most phones are locked to accept only apps (software) from approved venders. This code is used to unlock the phone so it will download and install third-party applications.

b) User Security Codes (or Blocking codes) : This code unlocks the phone so it can be used to make and receive calls. Without this code the phone is 'blocked' from making or receiving calls.

PUC Code: This code is required when a security code (or block code) has been entered incorrectly too many times. (For example: Someone finds a lost phone which has requires a security code to use the phone, and attempts to guess the code several times.) Once this happens, the phone becomes locked to where the security code can no longer be guessed. A PUC code must now be entered. And, the only way to obtain the PUC Code is directly from the cell phone company that provides service to the phone. (A PUC Code is sometimes referred to as a Master Unlock Code.) Without it, the phone can never make calls again. Attempting to guess the PUC code 10 times can/will damage the phone and the SIM card if the phone has one.

SIM Unlock: Sim Unlock, or Network Unlock is a code which when entered on the phone allows the phone to be used with different cell phone companies.

Hi,

If the phone is already locked due to putting a wrong code several times. it will lead to PUK security
all you have to do is to call your service provider to give you a PUK code to unlock your phone, they may require you to provide IMEI number of your phone, and they will also give you instruction on how to get it.

That will resolve your issue.


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browse for nokia 5310 express music dismantel guide on the net you will find a lot of site.

Nokia 6300 User Guide
1. General information
Access codes
Security code
The security code (5 to 10 digits) helps to protect your phone against unauthorized use. The preset code is 12345. You can
change the code, and set the phone to request the code. See "Security," p. 28.
PIN codes
The personal identification number (PIN) code and the universal personal identification number (UPIN) code (4 to 8 digits) help
to protect your SIM card against unauthorized use. See "Security," p. 28.
The PIN2 code (4 to 8 digits) may be supplied with the SIM card and is required for some functions.
The module PIN is required to access the information in the security module.
The signing PIN is required for the digital signature.
PUK codes
The personal unblocking key (PUK) code and the universal personal unblocking key (UPUK) code (8 digits) are required to change
a blocked PIN code and UPIN code, respectively. The PUK2 code (8 digits) is required to change a blocked PIN2 code. If the codes
are not supplied with the SIM card, contact your local service provider for the codes.
Barring password
The barring password (4 digits) is required when using the
For more information you can download through this link. http://www.o2.co.uk/deviceinfo/device-pdfs/nokia6300eng.pdf

To get the security code to unlock the cell phone from the current cell phone provider so you can use it with a different phone provider, Please click on this link and follow my instructions :-
http://www.fixya.com/support/r4049238-unlock_cell_phone
If your phone provider does not help you then this WEB site it provides security codes for a small price.
http://www.mobileunlockstore.com/?gclid=CKDb2_y2558CFSlJagodxBkDHw
Try this WEB site also - Unlock Free
http://www.unlock-free.com

your mobile is unlocked to some network and you are trying to use sim of other network so its asking code.
try common codes like 1111, 1234,0000 if they work, or you need to get it unlocked from mobile technician.

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Take your sim card out of your phone, put it in a different phone that you have the security code for, do a master reset then put your sim card back in your phone. Its the sim card that requires the master reset. Not the phone itself.