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by converting sound into an electrical signal via a 'liquid transmitter'
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allowed a single telephone to connect to multiple lines through a central switchboard -
Were communicated orally to a switchboard operator when initiating a call. -
To dial a number the user would insert their finger into the number required -
Rotary dial telephones used pulse dialing -
a cordless telephone needs mains electricity to power the base station -
They were two-way radios that allowed people like taxi drivers and the emergency services to communicate. Instead of relying on base stations with separate cells (and the signal being passed from one cell to another), the first mobile phone networks involved one very powerful base station covering a much wider area -
AMPS allocates frequency ranges within the 800 and 900 Megahertz (MHz) spectrum to cellular telephone. ... The signals received from a transmitter cover an area called a cell. As a user moves out of the cell's area into an adjacent cell, the user begins to pick up the new cell's signals without any noticeable transition -
The StarTAC held 100 phone numbers and had several large buttons on the keypad and spines. The StarTAC was one of the first phones to use a vibration motor so you could silently accept calls. Pull-out antennas were common in the mid- to late 1990s, and even persisted into the early 2000s -
In its first appearance onscreen and in Jobs's hand, the phone looked like a sleek but inanimate black rectangle. Then, Jobs touched the screen. Suddenly, the featureless rectangle became an interactive surface. Jobs placed a fingertip on an on-screen arrow and slid it from left to right
