FCC requirements dictate that the menu for changing the domain be available by password, which in this case is the LINE button.
To change the domain, start by shutting off the phone. Press and hold both the green and red keys until the phone starts up. Release the red key first and then the green and you will be presented with a password screen. Default password is 123456. Navigate to Network config > Reg Domain. Press LINE and then choose the domain of the country you are in. Complete by choosing a frequency and the power setting. Once chosen you will be placed back in the Network config screen and can continue configuring the phone.
01 - USA, Canada, Brazi
02 - Europe, Australia
03 - Japan
04 - Singapore
05 - Korea
06 - Taiwan
07 - Hong Kong
08 - Mexico, India