This paper investigates about the effects of addiction the smartphones. At present, smartphones will become an important factor in life. Most people give precedence to smartphones more than other things. The paper examines nowadays, smartphone can developing in advance. It has a lot of application. We can take it everywhere. It may be called a mini computer. The smartphone addiction affects a lot of bad things which had an effect for health, education and interpersonal interaction. The paper concludes, the addiction smartphones has a lot of disadvantage. It can affect childhood, teenagers and adults. If we want a good life, we should use the smartphone suitably and should realize and be aware of the disadvantage.