First, benefit of smartphone is we can check and do our globe or task quickly. And also it has complex networks, so we can communicate with our surrounding people. The other way, it has disadvantages ; we are exposed in radiation and electromagnetic waves nearly, so it can damamge our health. Then it can arouse a traffic accident because we do the smartphone when we walk on the road, and we don't watch out cars so we can be injusred seriously because of using smartphone on the road.

First benefit of smartphone is we can check and do our task quickly. Also, it has complex networks, so we can communicate with the people in our surroundings.
The other way, it has disadvantages; we are exposed in radiation and electromagnetic waves, so it can damage our health. It can also cause traffic accident because of using smartphone while walking on the road and we can't watch out for cars. We can be injured seriously because of using smartphone on the road.