Are you missing a traditional clock screensaver on your Nokia 5800? Due to the new touchscreen's high power consumption, Nokia has abolished the screensaver option altogether. TimeScreen offers a replacement for a traditional clock screensaver: A screensaver-like sleep mode, which you can activate in those situations where you wish to have the current time ready at one glance - without having to handle the phone.
When started, TimeScreen dims the display backlight to the lowest value and displays the current time in a large digital font. (We recommend placing the TimeScreen icon as a shortcut on the Home Screen.) Simply tap on the screen to deactivate sleep mode. Like a regular screensaver, the sleep mode also deactivates when you receive a message or a call.
As i have tested it does not work after Screen locked