C Spire vs T-Mobile Coverage Map
The map compares native (non-roaming) C Spire and T-Mobile coverage throughout the United States.
Map Usage
- Zoom close for the most detailed coverage data
- Use the search bar to compare C Spire and T-Mobile in a specific location
- Make different coverage comparisons by switching view modes
- Overlay: Shows distinct coverage areas of each carrier
- Winner: Colors each area by which carrier has better signal or better percent coverage
- Difference: Uses color intensity to show the magnitude of signal or coverage differences
Technical Notes
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Real-world relevance: When comparing C Spire and T-Mobile signal strength,
the map's difference view uses predicted RSRP values but colors hexagons based on expected real-world impact. A difference between -125 dBm
and -100 dBm (poor vs. fair) has greater visual impact than a difference between -90 dBm and -65 dBm (excellent vs. especially excellent).
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Metrics with high zoom: Zoom in for the most detailed picture. At the highest zoom levels (smallest hexagons),
the Winner and Difference views show signal strength comparisons between C Spire and T-Mobile.
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Metrics with low zoom: When zoomed out (larger hexagons), comparisons are generally based on
coverage percentage within each hex. Signal strength is only compared when both C Spire and
T-Mobile have 100% coverage of a hex. ⓘ
Data Sourcing
Cell coverage data for C Spire and T-Mobile comes primarily from the May 2026 release of the FCC's Broadband Data Collection program (representing networks as of December 2025), supplemented with real-world measurements from large crowdsourcing projects.
