Confermo quanto detto da daffy riguardo le icone nella barra delle notifiche.

Quoto dal blog di Google:
"Notification bar icons (Wi-Fi, network coverage bars, etc.): Turn green when you have an uninhibited connection to Google, white when you don't. Hint: if you're in a hotel or airport using Wi-Fi, the bars won't turn green until you launch the browser and get past the captive portal."