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Cell-phone companies were aware of the commercial value of the cell-phone. Cell-phone companies made the commercial potential of cell phone come true. Cell-phone companies knew how to make the potential come true. Cell-phone companies should have realized their products’ potential.
Right after cell phones were invented. Before the number of cell phone users reached a critical mass When cell phone users totaled to a certain number. When the number of cell phones decreased to a certain number.
There were more cell phone users during that period. The number of cell phone users reached about 100 million. More cell phones were used to call 911 when accidents occurred. Cell phones enabled people to have quick access to 911 services.
There were more cell phone users during that period. The number of cell phone users reached about 100 million. More cell phones were used to call 911 when accidents occurred. Cell phones enabled people to have quick access to 911 services.
The number of cell phones in use exploded in the late 1980s and part of the 1990s. The number of traffic deaths was reduced in the late 1980s and part of the 1990s due to cell phone use. Cell phone users are likely to be involved in traffic accidents. The use of cell phones has a life-saving effect for pedestrians and drivers.
Right after cell phones were invented. Before the number of cell phone users reached a critical mass When cell phone users totaled to a certain number. When the number of cell phones decreased to a certain number.
where; when when; that where; that that; where
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