After plugging in the sim slot back into your phone, the activation screen should show up. Press”Dismiss” Press the Home button, then press Emergency call. Enter the number *5005*7672*00# and call. ( or *5005*7672*88# ) Several options will show up and select the one saying”Select Perfect Unlock via ICCID” Now enter your new ICCID number. Hit send. Restart your iPhone and now you’re good.For some reason if it doesn’t work, repeat the process same one more time. After you got perfect unlocked.Don’t change your mobile sim or Reset your iPhone or update iOS by iTunes computer so that you can stay unlocked all the time.