Sprint Data Networks

While coverage maps do not guarantee coverage, they do provide a high-level view of your anticipated experience at a particular location. Certain parts of a residential or commercial structure, city, metropolitan area, or other geographic regions may have limited coverage.
What is the difference between excellent signal and fair signal?

Excellent Signal:

Approximation of an in-building experience. Note, indoor performance varies and there are other factors, many of which are beyond Sprint's control, that may influence overall in-building performance including building structure, building materials, etc.

Fair Signal:

Denotes areas with available outdoors/street coverage.