Smart phone is becoming an important part of our lives; howerver, it also has many disadvantages. First, use too much smart phone can cause physical and psychological problems. These are problems affecting the brain, eyes, musculoskeletal, obesity, depression… Second, use too much smart phone causes: dry eyes, eyestrain, blurred or red eyes, myopia and astigmatism,… Third, phone screens emit blue light, which inhibits the production of the hormone melatonin in the brain. This is the body's sleep regulator. From there, sleep and the body's circadian rhythms are disrupted. And there are many harmful effects of smartphones such as depression, joint damage, obesity, memory impairment,... Using a smartphone is not bad, but we need to know how to use it properly.

Nearly everyone has a mobile phone and the vast majority of these are smartphones that allow users to connect to the internet and run apps as well as sending texts and making phone calls. With a smartphone, waiting for things becomes less of a pain because you can keep yourself entertained; for example, you can read the news, play games, listen to music or watch a movie. Having a smartphone makes it much more convenient to check your email, social media or even you bank account while on the go .With a smartphone, you're no longer going to get in hot water using conversamtions away from the business's network, protect your privacy and stay within your employer's It usage policy. recent advances in technology mean you can now use your mobile phone in a similar way to a contactless bank card and pay for things just by tapping the screen.