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Scientists have reported adverse health effects of using mobile phones including changes in brain activity, reaction times, and sleep patterns. When mobile phones are used very close to some medical devices there is the possibility of causing interference with their operation. There is also the potential of interference between mobile phones signals and aircraft electronics. Some countries have licensed mobile phone use on aircraft during flight using systems that control the phone output power. Cell phones work by connecting to a cellular network, which people pay a subscription fee to join. The cellular network is a wireless digital/radio network that is made up of cells that are served by transceivers called base stations. The International Telecommunication Union measures those with Internet connection, which it calls Active Mobile-Broadband subscriptions (which includes tablets, etc.). In the developed world, smartphones have now overtaken the usage of earlier mobile systems. H...