Locating iOS Device IDs
Apple’s device ID know as the Identifier for Advertisers (IDFA) was created back in 2012 and replaced the Unique Device Identifier (UDID). The UDID was associated with the hardware of the device where as the IDFA is an anonymous and easily-resettable value. With the announcement of iOS 14, Apple announced new privacy measures which require all apps to obtain user consent before that user’s specific IDFA can be collected and used for data collection.
In order to locate a device’s IDFA, Kochava has created an app called My Device Identifiers which provides the ability to experiment with ATT (AppTrackingTransparency) to view and copy device identifiers such as the IDFA and IDFV.
Locating Android Device IDs
Android’s device ID known as the Advertising ID can be located in Settings > System > About phone > Status.
Your Advertising Identifier will be listed near the bottom of the phone screen.