I put my sim card in my husband old phone which is samsung SGH-A767. ANd now it is saying the phone is locked, my husband never put a lock on the phone. So I would really appreciate it if you could help my unlock the phone so that I may be able to use that phone until our contract is up

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
Default 6 Digit Security code: 000999 or 1122
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
OR:
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