You can get Unlock code from Simpleunlocking.com/supported-phones/rs16wp7/ and get Free Unlocking instructions from Mobileunlockguide.com/samsung-sgh-a877-impression and Unlock it step by step.
SOURCE: My keypad is lock on my Samsung A877 and i forgot
Did I just respond to this question??? Someone here just posted a very similar question on a Samsung device.
Normally I would expect the default value to be the last 4 digits of your telephone number. If you changed it, good luck.
Please try entering the last 4 digits.
If this doesn't work, if you changed the code, you will probably have to get help from the service provider or your manufacturer. http://www.samsung.com/us/consumer/mobile/mobile-phones/index.idx?pagetype=type
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SOURCE: unfreeze code for samsung a877
that is the PUK u can either call your service provider or go onto your wireless accout to obtain the code
SOURCE: help I need a subsidy unlock code for a samsung
Type in the phone *#06#, like you're going to call someone.
The IMEI/serial number will show up. Write this down, then call AT&T at 800.331.0500 and they will give you the code.
SOURCE: samsung impression a877 lost password to unlock
A hard reset will clear everything out of the phone and reset your password. To perform a hard reset on a samsung take out the battery and removve the sim card and power on the phone. when it comes back on type in *2767*3855#. The phone will go thourgh a reset process and when it comes back on take the battery out again and put your sim card back in and power on. It should be completely cleared including the security password.
SOURCE: I forgot my unlock code for the samsung sgh A877
First you will need to obtain the IMEI (serial number) for your handset. Type *#06# from your handset. The number that appears is the IMEI. Once you have this number you need to contact the Mobile Operator Customer Service department or use an online Subsidy Unlock service.
Device must be in Portrait mode.
Hit the Dial button on the touchscreen.
Type #7465625*638*Unlock Code #.
(Unlock Code is a unique 8 digit number).
Device will reply: Network Lock Deactivated.
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