What is a device ID?

A device ID is an identifier associated with a device or device user. In advertising, an available advertising identifier can help supported systems recognise signals for permitted uses. It is an audience input, rather than a statement about a person’s interests or intention to buy.

Different identifiers have different rules

The term device ID is often used loosely. Advertising identifiers, browser cookies and identifiers used within one company’s systems have different purposes and controls. The first step is to ask which identifier is actually being used, where it comes from and what it is permitted to support.

Android documentation describes user-resettable advertising identifiers. Apple requires permission through App Tracking Transparency for access to its advertising identifier and tracking within the scope of that framework. These controls affect what is available. A device-based approach should therefore never be presented as a complete view of all customers.

An identifier becomes useful through context

An identifier can connect supported observations, but the marketer still needs a reason to use them. A recent location observation, relevant content interest or a permitted client signal may contribute to a campaign audience. Each needs to fit the business question. Our location and behaviour article explains why interpretation matters.

For example, a vehicle campaign could explore signals relevant to a model category and dealership catchment. That is a hypothesis to assess. A device observed near a dealership is not automatically a purchaser, and several observations do not prove a transaction.

What should marketers ask

Ask what the source represents, how current it is, what geographic coverage is available and which uses are permitted. Also ask how an audience can be reached through the selected media. A large pool of identifiers is not the same as a deliverable campaign audience. Relevant exclusions, audience scale and measurement access all influence the plan.

These questions belong in the brief. Our audience creation walkthrough shows how to move from a commercial goal to signals, audience rules and a measurement plan.

Keep the outcome in view

The identifier is part of the method. The business outcome should decide whether the method is useful. A campaign might need awareness, enquiries or a booked appointment. Agree the evidence for that outcome before judging performance, and explain where reporting is estimated or incomplete.

Is a device ID the same as a customer name?

No. An identifier alone is not a customer name. Its data context and permitted connections need to be understood for each use.

Does device ID targeting remove the need for other media?

No. Media choices should follow the objective, available reach and audience needs. Different approaches can play different roles.

If your brief mentions device IDs, bring us the business question behind it. We can help assess the audience approach and the evidence you need. Talk to 36 Presents