My mom received her rose gold iPhone 7 plus 32gb on Monday on AT&T. I haven't received my matte black yet but anyway she charged it to 100% and took it to school with her Wednesday where she works. She maybe sent 3 text messages and by lunch she was down to 18%!! This was before she set up her email and she created a brand new Apple ID so there weren't any new apps draining the battery. I looked at her battery usuage Tuesday to see what used most of the battery the day before and the top 2 were home lock screen and messages. Has any else had severe battery drain?