Google Maps is commercial, even though it is free to use under some
circumstances.
For example, if you have a lot of traffic you will be charged for
maps.
You need to check this out.

I'm not sure what you are asking about 'coverage'
You can e.g. draw polygons on maps to represent coverage areas, thats
not difficult- if you have the data.
There are no tools in the Maps API to calculate coverage of a
particular tower etc.
To find if a given point lies in certain coverage areas is a geometry
problem, you don't need maps to solve that.

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