Android O introduces some improvements to help provide user control over the use of identifiers. These improvements include: limiting the use of device-scoped identifiers that are not resettable updating the Android O Wi-Fi stack in conjunction with changes to the Wi-Fi chipset firmware used by Pixel, Pixel XL and Nexus 5x phones to randomize MAC addresses in probe requests updating the way that applications request account information and providing more user-facing control Device identifier changes Here are some of the device identifier changes for Android O: Android ID In O, Android ID (Settings.Secure.ANDROID_ID or SSAID) has a different value for each app and each user on the device. Developers requiring a device-scoped identifier, should instead use a resettable identifier, such as Advertising ID , giving users more control. Advertising ID also provides a user-facing setting to limit ad tracking . Additionally in Android O: The ANDROID_ID value won&#