Third-generationmobilephones,knownas3G,arethenextbigste...
問題詳情：Third-generationmobilephones,knownas3G,arethenextbigstepforthetelecomindustry.Dataspeedin3Gnetworksismuchquickerthanthatinpresenttechnology.Thismeansuserscanhavehigh-speedInternetaccessandenjo...