The telephone has changed the world we live in. Just like in recent years the Internet has completely changed the way we live and learn, the telephone allowed people to instantaneously get in touch with other people the other side of the world, well before the Internet. This is the main advantage, in that these days anybody can get in touch with their friends or loved ones within a matter of seconds or minutes.
However, there are some disadvantages. In the modern day, there is actually growing concern that mobile telephones are emitting waves and signals that could potentially damage the brain. Given that mobile telephones, in historical terms, are relatively new we do not have any extended research on what these waves and signals are able to do to the brain. Hence, all we can do is carry on using the mobile phones and see what happens in the future. For all we know, these mobile phones could be causing cancers in a large proportion of their users. However, we could be completely wrong and find out that mobile phones don’t cause any damage at all.
What you must remember is that this disadvantage is only a theory, and the market sells a wide range of mobile phones that are not considered necessarily dangerous for your health. Nearly everybody owns a mobile telephone these days, and many people could not get by without one - if you were to purchase one then you would just be becoming one of the millions of people on earth that depend on these devices to get through their social and working day.
Whilst this disadvantage of telephones could potentially cause problems in the future, you must remember that the problem is not proven and you could end up being perfectly healthy in the future. Don’t worry, most people use telephones anyway.