Exhibit 99.1 UTStarcom Reports Unaudited Financial Results for Second Half and Full Year 2023 Hangzhou, March 22, 2024— UTStarcom (the Company) (NASDAQ: UTSI), a global telecommunications infrastructure provider, today reported its unaudited financial results for the six months and full year ended December 31, 2023, and provided a business update. Business Update • 5G transport network portfolio progress. In 2023, UTStarcom continued its cooperation with some mobile operators in China on the development of ...