My friend Vicky told me this great feature of my SE w800i phone, and im sure many other phones have the same feature, but I really really like it!
When you use your phone alarm to wake up or anything else you need it for, my phone doesnt need to be on for it to start ringing in the morning. No worries about ur battery, just set alarm and turn your phone off.
Try if yours has it.. very helpfull little feature to make life tiny bit better :)
