What should i have to do for change security code?

I suggest you leave the security code alone, it is used to clear the phone call logs etc.
I recommend to put a pin code on the SIM card to lock your phone's keyboard. When you open your phone or unlock the keypad to access the phone's menu etc. then you need to enter the 4 digit pin code. This also prevents anyone accessing your phone unless they have this pin code.

Changing the security code
Of course, if any potential phone thieves are reading this, they'll now know the default security code is 12345.

To change the security code, go to Menu > Settings > Security > Access codes > Change security code. When prompted, enter your current security code and click OK. The enter your new security code (a PIN between 5 and 10 digits in length), click OK and enter the new code again to verify it. Click OK and you'll see the message 'Security code changed

or
*#7328748263373738# resets security code.
Default security code is 12345

if you want change it just go to seetings security settings change access codes change security code firstly type your default security code 12345 and type the new security code for twice press ok and cogratulation

The default security code is 12345 if you have changed the security code before then you need to service the phone in any mobile service center to flash it. The phone accepts Security code after 15 mins every time when you enter the wrong Security code.So keep trying to remember the security code or service it.

Hello,

To change your security code from the default, follow these steps carefully;

1. Press Menu
2. From Menu, go to Settings,
3. From Settings, scroll to Security settings
4. From Security Settings, go to Access Codes,
5. Press Access codes and you would see Change Change Security Code.
6. Press Change Securty code and you would be asked to enter your old security code (which is 12345, the one your are presently using) and thereafter, you would be required to enter the new security code.

I wish you the best and don't forget to rate this.

Check out this link below to download a PDF manual, software, and more for your phone. Just copy and paste into your browser.

http://www.nokiausa.com/get-support-and-software/product-support/nokia-3585

SECURITY CODE from page 54 of your manual:
Your phone prompts you for a five-digit security code for certain features and commands.
Access is granted only after the correct security code has been entered successfully.
The default security code is 12345. It is recommended that you change this code at once,
write it down, and store it in a safe place away from your phone.
Important: When entering your security code, ***** is displayed on the screen to
keep others from viewing your code.
You can delete the last entered digit by pressing Clear (or by pressing and holding Clear to
delete all the digits more quickly). Enter the correct code or press Back to exit. If you enter an
incorrect security code (Code error will appear) five times in a row, your phone won’t accept
any entries for the next five minutes.
Change your security code
1 Press Menu 4-5-2-4 (Settings > Security settings > Access codes > Change security code)
and press Select.
2 Enter existing (or default) security code and press OK.
Security and System settings
3 Enter new five-digit security code and press OK.
4 Re-enter your new five-digit security code for verification, then press OK.
Your phone displays the confirmation message Security code changed.
Important: If you change your security code and don’t remember the new code,
contact your service provider. Once you change your security code, the default code
is no longer valid.

Hope this helps, let me know if I can help you with anything else. It would be very kind of you if this does work for you to please rate me or leave a short note. I would really appreciate it. Thank you for your time.
JimmyC

Enter the lock code instead of the security code. After then to change the security code.

1. Go to menu and there open settings.
2. There open security settings.
3. There will options such as change lock code or change security code etc.
4. If you have forgot security code then you can't change it, better change lock code as your desired password.
5. To change first get into change lock code and enter old lock code and after that input new password and its all done.

security code has nothing to do with IMEE number. A word of caution if you try to change security code 3 times your puk will be blocked and you won't be able to use your sim for anything. Nokia keeps security code as 0000 So just go to settings and then security and when prompted give 0000 if it accepts well and good you get the option of change security pin change it to desiered pin. if not don't try to change your code or else your PUK will be blocked and you will have to make a long call to your customer care from your friends mobile.

Go 2 ur SETTINGS->PHONE SETTINGS->SECURITY SETTINGS
->CHANGE ACCESS CODES->CHANGE SECURITY CODES.

if u hav not use ur security codes b4 this.key in 12345.after tat key in ur new security code no.
avoid ur sims card from bocking.change ur security level.use PHONE LEVEL.

i hope u can do it. ;)

i forget my security code my imei is 355383007782969