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5G is several parts. The high frequency, hugh bandwidth stuff doesn't go far.

The same as existing mobile frequency stuff has about the same penetration as existing service, but because its more efficient, it allows towers to increase power to expand their coverage area. Generally towers will modulate their output power to reduce coverage when congested, hoping devices will attach to other towers; works well when there's enough towers with overlapping coverage, but not as well when towers are sparse.

It doesn't have to be purely power either, antenna angle makes a big difference, and phased antennas mean you can change effective angle without mechanically changing the angle.