Due to the coronavirus pandemic, the world is in an unexpected moment of global uncertainty and change. Countries, cities and communities worldwide are moving through rotating economic lockdowns and stay-at-home orders. At ...
Economics & Business
Jan 26, 2021
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3
Optimized on-farm grain storage boosts food security in sub-Saharan Africa, as an ETH study in Kenya during the COVID-19 pandemic shows.
Other
Jan 12, 2021
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3
Ultra-small integrated circuits have revolutionized mobile phones, home appliances, cars, and other everyday technologies. To further miniaturize electronics and enable advanced functions, circuits must be reliably fabricated ...
Nanophysics
Jan 06, 2021
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813
Maybe you're like us. We're the folks who are on our smartphones almost all the time, even when we're with others. We know it annoys a lot of people, but we do it anyway. Why?
Social Sciences
Jan 04, 2021
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7
Climate change and biodiversity loss are laying bare our dependence on the natural world for everything from the food we eat to the air we breathe.
Plants & Animals
Dec 24, 2020
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247
A remote outback station about 800km north of Perth in Western Australia is one of the best places in the world to operate telescopes that listen for radio signals from space.
Astronomy
Dec 23, 2020
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133
Can information and communication technologies help maintain close ties in families who are scattered around the world as a result of (forced) migration? Vienna-based social anthropologist Monika Palmberger explores the role ...
Social Sciences
Nov 23, 2020
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2
In recent years, big data sets from mobile phones have been used to provide increasingly accurate analyses of how we all move between home, work and leisure, holidays and everything else. The strength of basing analyses on ...
Social Sciences
Nov 19, 2020
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34
When a garbage collector came to Ghina Ghaliya's house in the Indonesian capital and asked if she had an old mobile phone his children could use to access the internet, it sparked an idea for a broader campaign to help students ...
Education
Nov 06, 2020
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2
As you drive down the road leading to Jodrell Bank Observatory, a sign asks visitors to turn off their mobile phones, stating that the Lovell telescope is so powerful it could detect a phone signal on Mars.
Astronomy
Nov 04, 2020
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31
A mobile phone or mobile (also called cellphone and handphone, as well as cell phone, wireless phone, cellular phone, cell, cellular telephone, mobile telephone or cell telephone) is a long-range, electronic device used for mobile voice or data communication over a network of specialized base stations known as cell sites. In addition to the standard voice function of a mobile phone, telephone, current mobile phones may support many additional services, and accessories, such as SMS for text messaging, email, packet switching for access to the Internet, gaming, Bluetooth, infrared, camera with video recorder and MMS for sending and receiving photos and video, MP3 player, radio and GPS. Most current mobile phones connect to a cellular network consisting of switching points and base stations (cell sites) owned by a mobile network operator (the exception is satellite phones, which are mobile but not cellular).
As opposed to a radio telephone, a mobile phone offers full duplex communication, automatised calling to and paging from a public switched telephone network (PSTN), handoff (am. English) or handover (European term) during a phone call when the user moves from one cell (base station coverage area) to another. A mobile phone offers wide area service, and should not be confused with a cordless telephone, which also is a wireless phone, but only offer telephony service within a limited range, e.g. within a home or an office, through a fixed line and a base station owned by the subscriber.
The International Telecommunication Union estimated that mobile cellular subscriptions worldwide would reach approximately 4.1 billion by the end of 2008. Mobile phones have gained increased importance in the sector of Information and communication technologies for development in the 2000s and have effectively started to reach the bottom of the economic pyramid.
This text uses material from Wikipedia, licensed under CC BY-SA
