(Secret) Service Menu in Xperia X10

All the mobile phones I have had from Sony Ericsson would have a service menu, where the basic hardware could be tested. The X10 is no different.

When the phone screen is locked (The "Lock Screen" - the one with the blue rainbow! ), you push the physical buttons in the following succession:


Menu, Back, Back, Menu, Back, Menu, Menu, Back
 

Nothing is shown on the screen until the service menu pop up. Here you can test most hardware, like GPS, Compass, WiFi, touchscreen etc.