Founded in 1982, UIL is a specialized developer and manufacturer of mobile phone and electronic parts, producing key buttons, metal components, protective sub-materials (waterproofing, dust-proofing, heat dissipation), and accessories such as wireless chargers.
Its principal customer is Samsung Electronics, to which it supplies precision mechanical parts including side keys, SIM trays, and camera decorations, most recently supplying USIM trays for the initial production run of the new Galaxy S26 lineup.
Production is based at its headquarters in Paju, Gyeonggi Province, with subsidiaries in Vietnam and India; earlier disclosed figures put design capacity at roughly KRW 70 billion, KRW 350 billion, and KRW 100 billion respectively for the Paju, Vietnam, and India operations.
Since 2022 the company has expanded into e-cigarette components, first for a domestic client and, from 2023, as the only Korean supplier of parts to Philip Morris International (PMI), the world's largest e-cigarette maker, delivering through its Vietnamese subsidiary to PMI partner Venture International.
The company has further diversified into automotive electronics parts (including vehicle air purifiers), beauty devices, and IT accessories.
In the domestic e-cigarette parts space, competitors such as EM-Tech, Elentec, and Partron mainly serve a different domestic client, making UIL's PMI relationship a distinguishing feature. The controlling shareholder is UIL Holdings, which is in turn controlled by KTC.