The telephone has it's issues, but many of which were later solved with the introduction of the cell phone. It was suddenly possible to live at all times without ever being unreachable. You could be anywhere in the world and connect with anyone else, at any given time.
Today, in the U.S alone, 278.9 million people subscribe to a cell phone service. By comparison, there are 309 million people alive in the U.S according the 2000 census data.
Now that cell phone have become so unanimous, their implications have become more and more wide-spread. Check out our Prezi for the details:
Cellphones and their effects on human development. on Prezi
There are several ways this influences out lives and well-beings. For one thing, the World Health Organization now believes that there may be a link to cell phones and brain cancer. (Though their research may be flawed...)
Not to mention, I would personally trade a slightly increased risk of brain cancer for constantly available 911 access.
Something else to think about, a person's cell phone is always in reach. It has become impossible to escape our friends, family, or the entire world. With the internet connectivity they offer, Google, Facebook, MySpace (if you still use that, get with the times), eBay, and every other notable web service sit right in your pocket, just waiting for the urge to hit you to browse, surf, and communicate.
The cellphone brings lots of positives and negative to the table, but let's be honest, even if they shorten our live expectancies, cell phones aren't going anywhere.