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How to get a unique identifier for customers without registration? (E.g. Jodel app)

Imagine an application consisting of client downloads and a single server. Clients should be able to use the application without having to register a username, for example. (Therefore, getting a sense of anonymity using the app)

What unique data in a smartphone can be used to identify "anonymous" users and share them uniquely so that each user has their own personal data.

Can i use IMEI?

Is it possible?

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5 answers

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import android.provider.Settings.Secure;

private String uniqueIdentifier = Secure.getString(getContext().getContentResolver(),
                                                        Secure.ANDROID_ID);

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This works on both phones and tablets (something is not in IMEI) and avoids problems with ANDROID_ID(for example, several manufacturers always use the same ANDROID_IDon all devices).

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