Sim lock password - Samsung C3510 Cell Phone

Try going on youtube

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

The phone is not any network but still there is a sim lock with unknown password and no other sim card can not be used hard reseting codes default password are not working plz help

You are trying the sim lock, not phone lock so the sim card is locked.
The PUK is sim password. You have to call your network service provider to get your PUK code. They can ask the SIM no. which is printed at the back of the SIM card.
Tell me in case of any problem.

there is one option in the mobile Sim Lock..
i think your doughter hit Sim Lock option.
don't enter the wrong pin code because as you enter the wrong PIN code 5 times Sim will block
Sim lock having the same password as your phone password
default password is given in the guide book of mobile
see it from there & open the sim lock
if you don't want the same problem again then go to the settings there is one lock option ... hit on the sim lock ... then off it.. the lock will not appear in future..

if satisfies with the answer given by me
vote me

you can try to enter the password (note: attempting to enter the password several times might freeze your phone) SIM lock isn't that bad. you said it won't accept any sim? then that's bad. Get it a look and/or return it.

hi karen
my samsung phone is unlock insert sim sos.how to unlock the phone sgh-e250

the phone need to re format the software .. you just need a technician to re programmed the unit.. so that all the original file or data be reseted

Have a look at this:
http://www.gsmserver.com/items/item_details.php?id=9053