Energy & Green Tech

Improving solar cell efficiency with a bucket of water

Looking at your cell phone, you realize the battery is low, which means you have to make another long walk into town to pay money to charge the device. By the time you get home, it's getting dark. You light the kerosene lamp ...

Consumer & Gadgets

Foldable phone outlook hinges on price

Handset makers are racing to launch their first smartphones with folding screens but analysts warn the technology is still too rudimentary—and expensive—to woo consumers in large numbers for now.

Consumer & Gadgets

Huawei unveils 5G phone with foldable screen

Chinese telecoms giant Huawei on Sunday unveiled a phone with a folding screen, just four days after rival Samsung became the first major handset maker to offer the feature.

Consumer & Gadgets

Flexible display talk: Smartphone might fold around your wrist

A phone that folds? Smartphone vendors think it can capture imaginations as they work to come up with newer gee-whiz designs to sell phones. This month, there is one foldable phone in the wings that is capturing special attention ...

Hi Tech & Innovation

Augmented wheelchair effort shows admirable regard for independence

Real life in the public space is not exactly an elegant straight line. Ramps. Boxes. "Floor is Wet" signs. Store aisles calling for multiple right and left turns to reach shelves in pursuit. No small challenge for a person ...

Consumer & Gadgets

iPhone FaceTime bug lets callers eavesdrop

A newly discovered FaceTime bug lets people hear and even see those they are reaching out to on iPhones even if the other person hasn't answered their phone.

Consumer & Gadgets

Xiaomi's foldable prototype has wings and video gets mega-played

Yet another in-the-wings foldable thrown into the smartphone ring: this one from Xiaomi. This one has won considerable attention. Foldables-inundated tech watchers who saw it the concept via video said it looked "incredible," ...

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Telephone

The telephone (from the Greek: τῆλε, tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely recognized around the world.

The device operates principally by converting sound waves into electrical signals, and electrical signals into sound waves. Such signals when conveyed through telephone networks — and often converted to electronic and/or optical signals — enable nearly every telephone user to communicate with nearly every other worldwide. Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include ℡, ☎, ☏, and ✆.

This text uses material from Wikipedia, licensed under CC BY-SA