Since the introduction of mobile phones, concerns (both scientific and public) have been raised about the potential health impacts from regular use.[26] But by 2008, American mobile phones transmitted and received more text messages than phone calls.[27] Numerous studies have reported no significant relationship between mobile phone use and health, but the effect of mobile phone usage on health continues to be an area of public concern.
For example, at the request of some of their customers, Verizon created usage controls that meter service and can switch phones off, so that children could get some sleep.[27] There have also been attempts to limit use by persons operating moving trains or automobiles, coaches when writing to potential players on their teams, and movie theater audiences.[27] By one measure, nearly 40% of automobile drivers aged 16 to 30 years old text while driving, and by another, 40% of teenagers said they could text blindfolded.[27]http://en.wikipedia.org/wiki/Mobile_phone
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