Hi there, you will need a special code or software to unlock your phone please click on this link for more information http://www.youtube.com/watch?v=FV8LyIv_nYs about how to unlock your phone.
Did you mean the network unlock ? .If it so means, you can get the unlock code for Samsung SGH-A877 Impression from the online vendor Classicunlocking.com .For this you need to submit country ,network name and IMEI number.
You will need the imei number from under the battery (on the phone) and you can call at&t and ask them to help you with a FREE Unlock code, the number to at&t is 1-800-331-0500.& they should also give you the steps to unlock it. Good luck!
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