When AT&T first launched mobile phone service in 1946, no one thought it would become as big as it is now, 60 years later. These early cell phones weighed about 80 pounds, so they didn't have the maneuverability of modern cell phones. By 1948 the service had approximately 5,000 customers in the United States. In 1973, Motorola introduced the first cell phone that, weighing about 2.4 pounds, did not require heavy equipment to operate. It was only 10 years later that Motorola launched the first mobile phone, the DynaTAC, on the market. Over the years these phones became more common and also cheaper until Apple introduced the iPhone, which technically wasn't the first smartphone, but it was the first to take off and make smartphones popular among almost all social groups . After 28 years of mobile phones, in 2011 there was an average of 122 mobile phone subscriptions per 100 people in the developed world. This increased use of cell phones has had both positive and negative effects on society in recent years (AT&T). It has dramatically changed the way we communicate, but overuse can also cause problems ranging from addiction to headaches to social isolation. Going back a couple of years, almost no one in public places used cell phones like people do now. In fact the only people constantly on the phone were businessmen. This slowly changed as it became popular among common people and totally changed the way society judges smartphone use in public. As John Dvorak states; in recent years the situation has moved from disapproval to acceptance in places like restaurants. Years ago restaurants were full of conversations between tables, now this is just one end of the spectrum. Often at least a...half a sheet of paper...Free Cell Phones Dashboards." Communications Of The ACM 56.4 (2013): 38-40. Business Source Elite. Web. December 10, 2013.Syed, Sumayya Firdous, and Abu Sadat Nurullah. "Cell Phone Use and Social Life of Urban Adolescents: A Review of Trends in Information Management 7.1 (2011): 1-18 Web.Thomée, Sara, Annika Härenstam, and Mats Hagberg"Cell Phone Use and Stress, Sleep Disorders and symptoms of depression among young adults - A prospective cohort study BMC Public Health 11.1 (2011): 66-76". Premier Web. December 10, 2013. Walsh, Shari P., Katherine Marie White, and Ross McD Young “The Need to Connect: The Effect of Self and Others on Young People's Engagement with Their Cell Phones.” Australian Journal of Psychology 62.4 (2010): 194-203. Premier of academic research. Net.