SK Telecom is a wireless telecommunications services provider. Co.'s segments include: cellular services, which include wireless voice and data transmission services, sales of wireless devices, Internet of Things solutions and platform services; fixed-line telecommunication services, which include fixed-line telephone services, broadband Internet services, media platform services and business communications services; security services, which include physical security services and information security services; and commerce services, which include its open marketplace platform, 11st, its T-commerce business, SK stoa Co., Ltd., and related ancillary services.