A unique identifier assigned to a mobile phone or device for tracking and authentication purposes. Used in telecommunications and mobile marketing systems.
Modern compound of 'phone' (from Greek 'phonos' meaning sound/voice) and 'ID' (abbreviation of identification, from Latin 'idem' meaning 'the same'). Coined in the late 20th century with mobile technology development.
Phone IDs are different from phone numbers - they're like digital fingerprints that remain constant even if you change carriers or phone numbers. Privacy advocates are concerned because these identifiers can be used to track user behavior across apps and websites without explicit consent.
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