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The most useful invention telephone was invented in 1876. The inventor's name was Alexander Graham Bell. The first telephone  was not as useful as the modern telephone. It was too heavy compared to the modern ones. The first telephone had two parts: a transmitter and a receiver. In that time the telephone was too popular.

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In 1903 the dial tone telephone was innovated. The dial tone was very modern at that time that's why we are using these phones in some places. Also dial tone phone's are still modern but not as modern as the novel phones. However dial tone phones are not bluetooth. Also you need to remember the person's number like the cradle phones.

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In 1926, Bell innovated the telephone and made the cradle phone. Cradle phone was made with metal and plastic. This was a bit hard to call someone because you need to remember the person's number. The cradle phones design looks older than the first telephone but the cradle phone is newer. This could be the most challenging phone.

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In 1 September 2000 the Nokia 3310 innovated by the company Nokia. Everyone was crazy about this phone all the people was on the stores sleeping in front of the store to grab the first queue. This was the most practical phone. For example, it can fit our pocket very easily, the most crazy thinng about this phone is it has a game named ''Snake II''
It's 50 times better that the first telephone.

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In June 29,2007 the first iphone was released. Apple invented the smartphone. People can use the internet, make calls and listen to music. It changed all the mobile phones. People still use smartphones today.

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In the future, humans will communicate with their holograms. For example, you go to a store to buy a watch but the watch is a smart watch. You can face time with your friends with their hologram.