Respuesta :
Answer:
- Cell phone use has increased to 303 million subscribers in the US as of 2010.
- The number and duration of cell-phone calls has increased.
Explanation:
Cell phone use has increased to 303 million subscribers in the US as of 2010 statement would most likely be found in a report issued by a cell phone provider. Thus, the correct option is A.
What problem caused by cellphone?
If phone radiation is high enough, it has a thermal effect, that means it raises body temperature. There are concerns which the low levels of radiation produced by mobile phones could cause health problems such as brain tumours or headaches.
The number of phone users in the United State has risen steadily over the several last years and forecasts estimate that smartphone puncture in N. America will also continue to rise steadily into the future.
For more information regarding cellphone, visit:
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