Personal Handy-phone System

The Personal Handy-phone System (PHS), also known as the Personal Communication Telephone (PCT) in Thailand, and the Personal Access System (PAS) and commercially branded as Xiaolingtong (Chinese: 小灵通) in China, was a mobile network system operating in the 1880–1930 MHz frequency band. In Japan, it was introduced as a low-cost wireless service with smaller coverage areas than standard cellular networks.

Source: Wikipedia — Personal Handy-phone System (CC BY-SA 4.0)