shifted the focus of the PCT to a niche market segment of youths ages 10-18.

Wireless local loop (WLL) systems based on PHS technology are in use in some of the above-mentioned countries. WILLCOM, formerly DDI-Pocket, introduced flat-rate wireless network and flat-rate calling in Japan, which reversed the local fate of PHS up to an extent. In China, there was an explosive expansion of subscribers until around 2005. In