There is 1 “feature” (and I use the term loosely) in iOS that just drives me and most users we support insane. The feature involves iOS automatically adjusting the screen to the brightness around you.
One thing you can do secure an online account is to activate Two-Factor authentication. Twitter, Facebook, Google, Dropbox, iCloud, and most online email services offer two-factor authentication. With two-factor authentication, when you try to log into your account, you will receive a message