What is UMTS (Universal Mobile Telecommunications System)?

UMTS (Universal Mobile Telecommunications System) is a 3G mobile network technology that provides high-speed voice, video, and data services over cellular networks. It is part of the WCDMA (Wideband Code Division Multiple Access) standard and was widely used to enable mobile internet, video calls, and multimedia messaging before the introduction of 4G LTE. UMTS supports download speeds up to 42 Mbps with HSPA+ (High-Speed Packet Access) enhancements and was a key step in the evolution from 2G (GSM) to 4G (LTE).