What hardware button is this?

[N1c0_ds]

When I go in Settings>Buttons, there is a mappable button but I can't find what button it is :confused:

There's Button 1, 2, 3, 4 and 5. They all work but what is the other button left?

Note: The video calls are disabled, so the video call button brings me to the phone menu.

[stevebonning]

It would be helpful to know specifically what phone you have. On my Hermes 100 model Cingular 8525 the only other button is 'Button 5 (Press & Hold)' which is pretty self explanatory. A quick glance at your owner's manual should also explain any particular button options avail on your phone.