Later, when scientists can transform speech into electrical signals. Alexander Graham Bell (Graham Alexander Bel) has fabricated a phone and the phone will have to change the audio signal into electrical signals sent by the phone line, and then the destination phone, converts it back into electrical signals, audio signals, and the same communication calls in this manner that the wired phone or home phone. In the past, there have been words or terms relating to developing countries, is that "any country that has a phone number in the country to 40 per 100 population numbers of people treated with growth or as a developed country, and any country that has a phone number up to 10 numbers per 100 population, people assume developed countries is" to see that countries around the world, with its important phone call very seriously.
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