- Yeastar S Series WCDMA module - Supports: - China: Unicom 2100MHz - China Taiwan: Chunghwa Telecom 2100MHz, Taiwan Mobile 2100MHz, FETnet 2100MHz, TSTAR 2100MHz - China Hong Kong: 2100MHz - Thailand: AIS 900/2100MHz - South Korea: SKT 2100MHz, KT 2100MHz - Japan: Softbank 900/1500/2100MHz - Most of the Asia Countries: 2100MHz or 900/2100MHz - Ukraine: 2100MHz - Russia: 900/2100MHz - Most of the Europe Countries: 2100MHz or 900/2100MHz - Brazil: Nextel 2100MHz - South Africa: Vodacom 2100MHz, MTN 2100MHz - Australia: Vodafone 900/2100MHz, Optus 900/2100MHz