There is several reasons. You can communicate by texting or calling. You can also take pictures, play games, etc.
to talk to people who are not with you
cellphones and alarm clocks
Yes , Normally people get cellphones when they go to middle school
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An idea that can be used is the way that cellphones can contribute to cancer after a certain amount of possible time.
Yes they can be used for things like LED lights
The Cellphones because it was in the 1980's when people started using them and communicating, then they used computers to search and find out about the internet! :P
Go to Craigslist, there are used cellphones being sold there. Another place to check is eBay. Amazon.com also welcomes seller of used items, more likely you will be able to find used cellphones on Amazon as well.
Yes, because all cellphones can used for messaging and callsEXCEPT:IPadTouchPad
Yes cellphones can give you canser