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Newer code for the Curve contains a device self test application which includes the following tests:

Vibrator Test
Keypad Backlight Test
LCD Pixels Test
Handset Speaker Test
Handset Microphone Test
Handsfree Speaker Test
Headset Detect Switch Test
Headset Speaker Test
Headset Microphone Test
RF Antenna Test
GPS Antenna Test
Bluetooth Speaker Test
Bluetooth Microphone Test
Holster Detect Switch Test
Bluetooth Microphone
Light Sensor Test

This looks like a very useful application. Will someone share how it is accessed? I could not find it anywhere under Options so my guess is that it is an Alt+(something) code.