Click here for an updated list You may get your firmware upgraded at any Sony Ericsson Service Point. Latest Firmware (03/08/2004): R520m R4A008 P800 R2D02 - Phone: R2D US - Phone: R2F Elsewhere - Organizer: R2D02 - Bluetooth: R5A - CDA: R5A P900 http://www.sonyericsson.com/updateservice/P900/ T29s R3A010 T39m R4B003 T68m R8A015 T68i R8A015 T100 R9D T200 R7A006 T226 R3A06 T230 R4A011 T300 R1G001 - Uncustomized T300 R2D001 - T-Mobile T306 R1B005 T310 R3B003 T316 R1B005 T600 sw47 T610 R4C003 / (R6C005 in most areas) T610 R4D001 - Vodafone T616 R1B027 T616 R1B027 Uncustomized T630 R4C003 / (R6C005 in most areas) Z200 R4E Z600 R5B001 / (R6C005 in most areas) How to find the firmware revision on your Sony Ericsson phone: Most Sony Ericsson phones have a special combination of button pushes to get to the service menu screen. You will need to press "Right * Left Left * Left *" to get into the service menu. Next click on service info and then Software information. Right and Left are accomplished different ways depending on your phone. If your phone has arrow buttons, then the left arrow and right arrow buttons are what you will need to press. If your phone has a joystick, then you will need to toggle it right and left. If your phone has a jogdial, then right is clockwise, and left is counterclockwise. From the service menu, you can also check your lock status by selecting the simlock option. There will be numbers and padlocks on this screen. The number represents the amount of tries you are allowed to unlock your phone. The padlocks will let you know if that service is locked or not. If the padlock is open, then that service is unlocked. If the padlock is closed, then the service is locked.