Is there way to may my phone beep when it goes into data mode to alert me?

My phone seems to have the arrows turn green extremely often, and for a very short time each time.. just not sure why it is doing it. If I turn off the wireless part and turn it back on, it stops this until I use vision again sometime.

Anyway to tell what is using the data service?

maybe a 3rd party app that can snoop the programs or something? An alert as to when the data becomes active would be nice though..