At the beginning of this decade,cell phone companies could use only a small portion of the radio frequency band because software did not exist that could scan the entire radio band and find any unused frequencies.Six different companies employed ____________________ to develop such software.

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The Answer of At the beginning of this decade,cell phone companies could use only a small portion of the radio frequency band because software did not exist that could scan the entire radio band and find any unused frequencies.Six different companies employed ____________________ to develop such software.

At the Beginning of This Decade,cell Phone Companies Could Use