Go to your phone's settings menu, and configure the device so each time the phone is turned on, your password must be entered to access information, says Carl Tsukahara, chief marketing officer for Clairmail, a San Rafael, Calif., company that provides mobile banking services to major banks.
Use the password feature on the phone when it comes out of the power-saving mode as well, he says.
When your phone is locked, it's unlikely a thief could get access to mobile banking personal information if it ever gets lost or stolen, he says.