Thanks Meter 3
Join Date: Jan 2008
Location: On a cell tower
I'll get specific for you.
1. Sim unlocked
(the most common unlocked terminology) means you can put any sim in the device and use that carriers network.
As far as ROM flashing goes (don't get the two confused)
2. Security unlocked and Hard SPL.
Hard SPL is for flashing a ROM, However since you live outside the U.S. you might want to flash a Radio, This is were Security Unlocking comes into play.
If you want my recommendation, Use "Olipro's" unlocker in the Raphael Rom Development section. It is worth the money and very easy to use.