Smartphones, since it was released in 1999 by a Japanese company, have become so popular that they are indispensable today. Although, smartphones are useful fo people in many ways, they certainly have some drawbacks.
 Firstly, the main purpose of using smartphone is better communication.  We can make calls worldwide, keep in touch with friends and families by text messaging , usual call, video calls and much more.
Secondly, smartphones are good  because they are smart, multifuctional. They serve mostly all our needs. They are ipod, hone, breakthrough Internet communicator. We can use them to listen to music on smartphones's apps immediately. They are search engines, we can find anything we want such as documentaries, news, thanks to the Web browser . We can use smartphones to look after our health, they can follow our heart rate, cout calories burning while training.
  Apart from that, smartphones are a huge source of entertaiment. They can give us thousands of stories. We can watch films with high quality without waiting for it to be displayed on TV.  Besides, smartphones are becoming  cheaper, we can easily afford a smartphone with an accepted configuration.
 Thirdly, they are portable, for instance, smartphones can fit in our pockets, we can carry smartphone as we do not want to miss important calls
  On the other hand, smartphone still have serious disadvantages which we cannot ignore.
 First, smartphones can cause cancer. Electromagnetic waves cause important health problem. The waves are absorbed by our brains, They increase memory loss and also lead to brain cancer.
 Sometimes, smartphones cause addiction. Nowadays, people stick their eyes on the screen, they prevent us from communicating and understanding the world.
In conclusion,  smartphones make our life easier, but at the same they are  killing us  secretly and quietly