I cannot open the security lock from all of my files

Im assuming its a samsung phone
Samsung cell phones come with many security features.
In addition to the common feature of preventing calls after a period of inactivity, some Samsung phones also allow you to prevent others' use of your phone's SIM chip and access to your files.
One password unlocks the various locks, except for two other passwords used for the SIM chip. The syntax of the menu items to click to reset a password differ somewhat between Samsung models but you can figure out roughly how to apply instructions for one phone to another.

1
Lock the phone from making calls by clicking "Start" or "Menu," "Security Settings" (or "More" and then "Security"), and "Phone Lock" or "Device Lock."
Change the password by clicking "Start" or "Menu," "Security Settings," and "Change Password." Then enter a new password.

2
Set the phone to work only with the current SIM chip by clicking "Menu," "Security Settings," and "SIM Lock."
Enter a new password when prompted.

3
Prevent unauthorized use of your SIM card by clicking "Menu," "Security Settings," and "PIN Lock." Type a new PIN when prompted.
4
Prohibit access to your files, messages and contact list by clicking "Menu," "Security Settings," and "Privacy Lock."
Enter the password from Step 1 when prompted to unlock access.
Reset the file lock/messages/contact password by resetting the phone lock password, as in
Step 1

What do you mean by Security code.

SIM pin code:
This is a pin code that locks the sim card until you enter the correct code. This protects your account, even
if your sim is put into another handset. To reset it, you need the PUK code:
Pin Unlock Code (PUK)
If you miss key (or forget) your SIM pin code, and enter the wrong one 3-5 times in a row, the SIM will lock up, and you’ll need to enter the PUK unlock code to release it. You should ask your Network Service Provider for this code when you need it. Don’t try to guess it, because after a few wrong guesses, the SIM card will be permanently disabled.
Phone Security Code:
This locks the handset, as opposed to the sim card. You can also set some handsets to only accept a “new” sim if the phone security code is entered. To reset it, you need the Master code code:
Master Reset Code
Sometimes known as the Master Code, this allows you to unlock a handset if you have entered the Security Code wrongly too many times.
Which is the one that you want?
Special Code/Service Provider Lock Code:
This code is required to allow a phone locked to a particular network's SIM cards to be used with a SIM card from another network. Orange and T-mobile lock handsets in this way, though O2 and Vodafone are beginning to lock PAYG and WAP handsets. The unlock code varies from individual handset to handset.
Blacklisting:
This is not a security code, but it works like one! To help combat mobile phone thefts, the networks share a database of the IMEI (International Mobile Equipment Identity) of mobile phones that have been reported stolen. Once a phone is on this list, it will not be allowed to use any of the networks.
This can be a risk if you buy a second-hand phone, because if it has been stolen, or if an unscrupulous seller makes an insurance claim after selling, the phone you bought in good faith may be permanently disabled.
Be very careful to check the source of a second-hand phone!
-----------------------------
The default security code for Nokia is 12345
IMEI: 356406017443168
Master code: 5335036136
Take your SIM card out first.
This is the code needed to reset the Security code, nothing else, and it’s for your phone only. You type in the security codes (anything) until the phone request the Master code; when it does, leave your phone still, don’t use it for 15 minutes, then type in the Master 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

Type *#06# at the mobile screen to know IMEI no of your mobile.
send the IMEI no to me and i will reply you with unlocking code.
IF Problem not Solved So
Please New Software install in the Phone Problem will Solved

If For puk & pin cod problem So Please
Very Best Solution:You Go To Service & Sim Office and Get The Puk code And Pin code From Office oprator
Enter The Puk code and Yes
Enter The pin code and Yes
So Puk code Open and Problem will Quickly Solved

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.

If u enter PIN code incorrectly 3 times, PIN will be blocked n phone will ask you for PUK(Personal Unblocking Key). This is a 8 digit code. If u enter Incorrect PUK for 10 times Your SIM will be lock permanently.

Your cell phone service provider can(Call from other no. n ask tell them for puk of ur no.) give you the PUK code aft3r answering simple security question.
Later enter PUK than enter new PIN, confirm new pin. Go to -Setting
-Security
-SIM lock
-off
Disable SIM n Later Phone Lock
PS:(You have to block your PIN to get access to PUK,
Default PIN- 0000, 12345)

u have to flash your handset

Enter lock code instead of security code.

to unlock the phone, use this command
*2767*3855#
disclaimer: all information save on the phone's memory will be erased.

but try without SIM:
*2767*2878# Custom E2p reset
if this doesn't work, then try:
*2767*3855# Full Reset
but be careful, because the last code will delete everything in your phone

There's a Security Code and Lock Code.

Resetting the Lock Code:
Remove the battery and replace it after 1 hour or more. The default Lock Code should reset to "1234". If that doesn't work try the last four of your phone number.

Resetting the Security Code:
The default Security Code is 12345. If this doesn't work go to your normal interface and type in "#3001*12345*. Go to the Security option, write down the number, then press "Ok". Back out of it all and it should take you back to your normal phone interface. The number your found should be your security code.