The binding legal principles established are: (1) The classification of goods for customs duty purposes must be determined according to the objective characteristics and properties of the goods as determined at the time of their presentation for customs clearance. (2) In interpreting tariff headings involving evolved technology, courts must give meaning to composite concepts (such as 'telephones for cellular networks') as single concepts in their modern technological context, rather than applying historical definitions divorced from current technological reality. (3) Where a tariff heading is divided into mutually exclusive categories (telephones versus 'other apparatus'), a product cannot be prima facie classifiable under both divisions, thereby precluding the application of General Rule 3 of the Harmonised System. (4) A smartphone possessing the objective characteristics of a telephone for cellular networks (portability, speaker, microphone, sim card capacity, dialing functionality) is to be classified as such, notwithstanding additional computing or Internet browsing capabilities. (5) The Harmonised System must be interpreted uniformly by national courts in accordance with international agreements and should not be subjected to purely domestic interpretation approaches.