Looking back at the development of the cellular phone, it has actually taken the path of convergence with other technologies all along: from single-band to dual band and triple band; from pure voice capacity to the integration of images and the addition of notebook functions, MP3 and radio capabilities; all the way to integrating digital photography, the Internet, e-mail, and so on.
回顧手機的發展，其實也一直走在整合其他電子設備的道路上：從單頻到整合雙頻、3 頻，從純語音到整合影像，接著加入記事本、MP3、收音機功能，再到整合數位相機、上網和收發電子郵件等等，種種功能不斷附加在一支小手機上。