Cellular System!!!

Hello ,
In the "How Cell Phone Works" article in this link Howstuffworks "How Cell Phones Work" i have a questions:

1.what does it mean by the cell-phone carrier receives about 800 frequencies , does the carrier here is the person and if yes does s/he receives 800 frequencies alone ?

2.A single cell in an analog system uses one-seventh of the available duplex voice channels. That is, each cell (of the seven on a hexagonal grid) is using one-seventh of the available channels so it has a unique set of frequencies and there are no collisions , so if somebody enter the page i mentioned above he will find that there is 9 cells not only seven , or it means that for every 7 cells 7 channels and every cell has 1 of these channels.

3.-A cell-phone carrier typically gets 832 radio frequencies to use in a city.
-Each cell phone uses two frequencies per call -- a duplex channel -- so there are typically 395 voice channels per carrier. (The other 42 frequencies are used for control channels -- more on this later.)
-Therefore, each cell has about 56 voice channels available.What does this mean ?
I will be waiting for the answer from anyone loves to help.

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This is part of cellular (or radio frequency in general) engineering. Why are you asking these questions ?