Hi pariskl: thanks for posting in the volunteer user-to-user Google Voice Community forum.
Well, your question has nothing to do with Google Voice, Google's telephone calling and messaging service but I can't resist helping you get rid of Bing.
Open the Chrome Browser app on your Android phone. Tap the three vertically-stacked dots in the upper right corner of the screen, then tap Settings. Under "Basics", tap Search Engine, then change it from Bing to Google.