Numbers of smartphone users are growing rapidly. In this scenario, any adverse health effect or event, even in small magnitude, can be a potential public health threat. Beside radiation exposure, smartphone is changing lifestyle patterns, especially among youth. It can be seen very easily at all public places as well as in family. The lifestyle pattern changes in relation to smartphone use have a very wide dimension. It can affect relationships, physical health, eating behaviour, sleep hygiene and many other health dimensions. Research is needed to cover all these issues.