It can be said that a mobile device is one of the most important and essential tools for living a life nowadays as 91% of all people on earth have a mobile phone in the middle of 2013 (Supermonitoraggio, 2013, paragraph 1). According to Super Monitoring, by the end of 2013 the number of mobile devices will exceed the number of people on Earth. Among mobile users, most surprisingly, 56% of people own a smartphone and 50% of mobile phone users use cell phones. as the main Internet source. In other words, more than a quarter of Internet users worldwide currently rely on mobile devices to collect their information, primarily through the use of smartphones. Due to information convenience and portability, smartphone ownership increased from 35% in 2011 to 56% in 2013 among all mobile device users. Meanwhile, it is also very easy to see many people using their smartphones for entertainment purposes such as gaming and social networking rather than for gathering information as shown in statistics (Super Monitoring, 2013). As a result, it is very evident to find some critical disadvantages in the excessive use of mobile devices for entertainment, especially among young children and student users. Therefore, this essay will focus on explaining the significant disadvantages of using smartphones or mobile devices regarding possible health, social, and financial problems. First of all, there are many health problems reported from daily use of a smartphone. According to Science Daily, “Of 1,049 people surveyed, 70% of adults and 30% of children and adolescents reported musculoskeletal symptoms in different parts of the body related to the use of electronic devices… half of paper… ...india.com. (2013, August 19). Warning: your smartphone could damage your eyes. Retrieved from http://health.india.com/news/smartphones-could-ruin-your-eyes/The Department of Rehabilitation Sciences, Hong Kong Polytechnic University and the Hong Kong Physiotherapy Association. (2013, September 5). Studies on the health effects of using portable electronic devices. Retrieved from http://www.sciencedaily.com/releases/2013/09/130905160452.htm Silverman, D. (2013, June 25). PC sales continue to decline; Apple will overtake Microsoft in 2015. Retrieved from http://blog.chron.com/techblog/2013/06/pc-sales-continue-their-declin-apple-to-overtake-microsoft-in-2015/ Super Monitoring. (2013, October 1). Mobile 2013 Status [Web Log Message]. Retrieved from http://www.digitalbuzzblog.com/infographic-2013-mobile-growth-statistics/