I have a Samsung Galaxy S3 with AT&T Wireless. I went on their website and found their "Online Chat" support. I told the support person that I needed to unlock my phone so I could use a prepaid SIM while traveling overseas. Three minutes later I had my unlock code, no questions asked.
Serious answer:
The bright orange/red bar saturates my red cone cells,
leaving an "afterglow" green bar burned into my vision.
It fades away after a minute or two.