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Your Mobile Advertising ID (MAID) is a device-specific identifier used for advertising and measurement. On Android devices, this is commonly called an Advertising ID, AAID, or GAID; on Apple devices, it is called an IDFA.
You can find your mobile device’s Advertising ID on iOS using an app such as Get My IDFA or My Device ID, and on Android by going to Settings and selecting Ads.
It should look something like this:
12345678-1234-1234-1234-123456789ABC