- Internal validity
Smartphone is possessed of various facilities, such as received news, transmission data and communications that easy. Including the application in smart phone can help to relaxing like listening to music or playing games. That's why students bringing smart phones used in many things, but in different groups.
- External validity
In present the Smartphone is a facility that is constantly evolving. It made popular and prevalent in society. Including the students need a great deal of information and news and utilized a different way.