Google Fi overview

November 2, 2025

Google Fi is a 5G MVNO optionally using WiFi UMA for calling and data. Google Fi works with most phones. Optional AI-enhanced audio that works on most phones can sound dramatically better on phone calls. Currently Google Fi uses T-Mobile network coverage. T-Mobile currently has arguably the best coverage vs. speed in much of the USA.

Google Fi does not seem to exaggerate coverage area as the FCC had found for some carriers. As usual, coverage is for ideal standing outside use. Zoom in to see more detail in the coverage data.

To significantly enhance mobile coverage in car in general (not just for Fi) requires a bidirectional amplifier as available from Wilson Amplifiers / WeBoost, costing several hundred dollars and requiring an outside antenna mount.