Smartphone is on boom. The concept of smartphone is to use a mobile phone not only for its voice communication function, but for its functions as a portable computer. That is, a smartphone is a telecom device with PDA function. It is believed to be an inevitable trend as the demand for mobile internet access grows. As smartphone models are released on the market, sales competition becomes intensified recently. The firebrand of this boom of smartphone is PHS.

Many factors made PHS the firebrand. For example, the original concept of PHS is to use an indoor handset out of the indoor area. The famto-cell concept is becoming remarkable recently, but it is indeed an idea created by PHS more than 10 years ago. Again, the goodness of PHS is proved.

(A.S.)