Yes, T-Mobile/Sprint. However, given that they've merged and T-Mobile is actively integrating the Sprint network, it will realistically just be T-Mobile soon.
T-Mobile has announced that it will be decommissioning 7,000-8,000 Sprint cell sites by the end of 2021 and 35,000 by the end of 2022. Around 10,000 Sprint cell sites will also be removed from the Sprint network and added to the T-Mobile network during this time.
Google Fi phones tended to camp on the T-Mobile network most of the time and any advantage of being able to also use the Sprint network will be gone soon. Even before Sprint towers are decommissioned, many will have most of their spectrum/capacity moved to T-Mobile towers. T-Mobile has been aggressively moving Sprint's 2.5GHz spectrum to T-Mobile's network to provide Ultra Capacity 5G and they've moved some of Sprint's PCS spectrum as well. I wouldn't expect much of a Sprint network left a year from now.
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What towers / network(s) is Google Fi serving from in the US? T-Mobile/Sprint?
Yes, T-Mobile/Sprint. However, given that they've merged and T-Mobile is actively integrating the Sprint network, it will realistically just be T-Mobile soon.
T-Mobile has announced that it will be decommissioning 7,000-8,000 Sprint cell sites by the end of 2021 and 35,000 by the end of 2022. Around 10,000 Sprint cell sites will also be removed from the Sprint network and added to the T-Mobile network during this time.
Google Fi phones tended to camp on the T-Mobile network most of the time and any advantage of being able to also use the Sprint network will be gone soon. Even before Sprint towers are decommissioned, many will have most of their spectrum/capacity moved to T-Mobile towers. T-Mobile has been aggressively moving Sprint's 2.5GHz spectrum to T-Mobile's network to provide Ultra Capacity 5G and they've moved some of Sprint's PCS spectrum as well. I wouldn't expect much of a Sprint network left a year from now.