Hooray for the 21st century! The official Disneyland App is available for free in the Apple App Store & Google Play.
The App is a total lifesaver! It will allow you to: buy tickets & scan them from your phone, scan annual passes for entry from your phone (though you still need the actual pass for Fast Pass & AP discounts), & view attraction wait times, character locations, restroom locations, closest dining locations (& book dining reservations), shopping locations, PhotoPass locations, entertainment schedules. See below for a few photos of the App.
ATTRACTION WAIT TIMES: