Are you restoring from iCloud perhaps?noticed this on my 6+, usage will equal standby, but only when wifi is connected. When I use normal cellular data, it will show standby correctly.
Makes me think it has something to do with iCloud? What else "goes active" once wifi is turned on?
Are you restoring from iCloud perhaps?
That can be a reason but can easily be (and often is more likely to be) something running or stuck in the background even with the display off.Simply put, if your standby time is equal to your usage time, that means your display is not going to sleep. Check your auto-lock settings in the settings menu to ensure it's NOT set to "never" (set it to anything else other than "never"), and make sure you put your screen to sleep when you're not using it.