Announced today, the Sony Ericsson Z310 has a polished finish. The front icon display is 
integrated into the design, hidden discretely beneath the surface until a message or call is received. There are even eye-catching colored light effects that can be assigned to contacts in the phonebook; so users can know at a glance who is calling. The seamless, semi-transparent finish on the front of the phone allows the display icons (which signal when a new event takes place on the phone) to be ‘hidden’ beneath the surface.
And a separate external display, also concealed under the surface of the phone, lets consumers know exactly who is calling.
Adding to the striking design is a series of novel light effects that serve to both personalize the phone and allow the user to ‘color code’ their contacts. Simply assign a colored light to frequent callers and users will know instantly whether its work trying to reach them, their best friend fixing a date, or their mother calling to invite them to Sunday lunch. It is even possible to set the look and feel of the menu and screen display to match the time of day; a bright theme during the daytime and something more relaxing or subtle at night. Sony Ericsson Z310 Announced - Mobiledia