1. Did you reboot after installing avast?
  2. hmmm, my Thrive is not a phone
  3. the newest version …1069 allows you to not display the icon. I see no point in not displaying.

I am trialing it on a Thrive tablet. Works great. See my blurb in the Beta section
http://forum.avast.com/index.php?topic=90144.0