Final answer:
Global System for Mobile Communications (GSM) is a technology used in a cellular telephone network, enabling phones to connect to a network and make calls or access data services.
Step-by-step explanation:
In a cellular telephone network, a technology used is Global System for Mobile Communications (GSM). GSM is a standard developed by the European Telecommunications Standards Institute (ETSI) and is widely used for mobile communication and data transfer. It enables cellular phones to connect to a network and make calls or access data services.