Unlocking an a887 Samsung is possible, here are the steps you need to follow to unlock your phone without the passcode:
- Get your IMEI number (press *#06#
- Use your IMEI number to request a lock code from the carrier, there are also services online (vet them carefully though, some are scams).
- Once that's done, power up without the SIM inside
- Type in #7465625*638*Unlock code# (8 digit unlock code)
- The phone should display: “Network Lock Deactivated"
- Phone may automatically reboot, if not - do it manually.
That should be all you need to do to get your phone back on the road. Sometimes the unlock code can take a while to generate though, so be patient!