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On the AT&T Network, to unlock the Pantech C520 Breeze:

Insert non AT&T or Cingular SIM card
Power on the device
The display will show “Change SIM” and Left Soft Key will be labeled “Unlock”
Press Left Soft Key - A “Password” box will appear on display
Enter Unlock Code (8 digit code)*
Press “OK” - Center Soft Key
The device will [...]

On the AT&T Network, to unlock the Samsung Access A827:

Power on with an AT&T SIM (SIM does not need to be active)
Type in #7465625*638*Unlock code# (8 digit unlock code*)
Device should say: Network Lock Deactivated
Phone may automatically reboot

*The 8 digit code can be obtained by calling AT&T Technical Support and given the representative the IMEI number. [...]

On the AT&T Network, to unlock the LG Vu or CU920, it’s pretty simple:

Put a AT&T or Cingular SIM in the phone; it does not have to be an active SIM
Enter *#865625# then the 16 digit unlock code*
Device should say: Network Lock Deactivated
Phone may automatically reboot

*The 16 digit code can be obtained by calling AT&T [...]

On the AT&T Network, to unlock the Pantech C150:

Insert non AT&T or Cingular SIM card
Power on the device
The display will show “Change SIM” and Left Soft Key will be labeled “Unlock”
Press Left Soft Key - A “Password” box will appear on display
Enter Unlock Code (16 digit code)*

Press “OK” - Center Soft Key
The device will display [...]

On the AT&T Network, to unlock the Samsung A517:

Power on without SIM
Type in #7465625*638*Unlock code# (8 digit unlock code*)
Device should say: Network Lock Deactivated
Phone may automatically reboot

*The 8 digit code can be obtained by calling AT&T Technical Support and given the representative the IMEI number. In exchange they will give you the Subsidy Unlock Code.

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