Sony Ericsson Z600

Hi,
Just got a Z600.
My green light never stops flashing, even with no unread calls.

I could have sworn that the flashing green
light on the side when the phone is closed
was to notify of a missed call or message.

Does anyone else's z600 do this, or am i missing something in the phones
setup that it's notifying me of.

Or is it just supposed to always blink when there's reception.

Thanks