I've been given a Nokia 6630, and though it came with a
user guide I still can't fathom what the green LED on the
top right-hand side of the fascia does, or what it's supposed
to do. It doesn't blink when the battery runs down (I've
cycled the battery twice to give it a good start in life), and
it doesn't blink when I receive a call or a text. In fact it
doesn't seem to do anything at all. Can someone here tell
me what it's for, please?