telephone logo, Telephone call Computer Icons Symbol, Phone transparent background PNG clipart size: 914x980px filesize: 33.57KB.telephone call illustration, Telephone Logo Computer Icons, phone icon transparent background PNG clipart size: 541x541px filesize: 19.64KB.end call button, Telephone call Button Computer Icons, Button transparent background PNG clipart size: 1000x1006px filesize: 9.83KB.WhatsApp logo, WhatsApp Computer Icons Telephone call, whatsapp transparent background PNG clipart size: 1019x1019px filesize: 137.25KB.telephone icon, Telephone call Computer Icons iPhone Symbol, TELEFONO transparent background PNG clipart size: 980x980px filesize: 69.06KB.blue call icon, Dialer Android Google Play Telephone, phone transparent background PNG clipart size: 1280x1280px filesize: 72.45KB.iPhone Computer Icons Telephone call, Phone Call Icon, blue call icon transparent background PNG clipart size: 1024x1024px filesize: 46.55KB.phone contact icon logo, iPhone Computer Icons Telephone call, phone icon transparent background PNG clipart size: 512x512px filesize: 16.83KB.The first hand-held mobile phone was introduced for personal service starting in 1973 by Motorola.

For greater mobility, various radio systems were developed for transmission between mobile customer stations on ships and automobiles from the 1930s by the mid-1900s. This gave rise to landline telephone service in which each telephone is connected by a pair of dedicated wires to a local central office switching system, which developed into fully automated systems starting in the early 1900s. Being impractical beyond just a few customers, these systems were quickly replaced by manually operated centrally located switchboards. The first telephones were directly connected to each other from one customer's office or residence to another customer's location. A telephone converts sound, typically and most efficiently the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user. A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.

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