OnePlus has officially started to push out the OxygenOS 4.0 OTA update(based on Android 7.0 Nougat) to OnePlus 3 and 3T users.
The update, baked into the phone brings all the goodness of Android Nougat including a plethora of new features and bug fixes. The update includes new notification design, new setting menu design, a feature to reply directly from the notification, multi-window functionality, status bar icon options, support for custom DPI, and an improved shelf customization.
The update is being rolled in phases to some handpicked devices and will eventually hit most of the OnePlus 3 and 3T devices.
Source: OnePlus