普通市内电话是地道的有线电话,属于有线通信范畴。无绳电话虽然是有线通信与无线通信结缘的产物,但只是局部无线化,即将手机与座机之间的连线改用无线电波维系,而座机仍然要受电话线的束缚。 移动电话是典型的无线通信,但它与普通市内电话是两大独立的通信系统,在电话号码编排上自 Ordinary city calls are authentic landline, belonging to the category of wired communications. Although cordless telephone is a product of the connection between wired and wireless communication, it is only a part of wireless, that is, the connection between a mobile phone and a landline phone is changed to a radio wave, while the landline phone still has to be shackled by a telephone line. A mobile phone is typical of wireless communications, but it is two separate communication systems with a regular local phone, arranged in a telephone number from