Google Fi Expands to Second 5G Network, Keeps Partner Identity Secret
Google's wireless service is upgrading to dual-carrier 5G connectivity in the United States, but the company is declining to reveal which second network it has partnered with.
Google announced a "super network" enhancement for Fi, its mobile virtual network operator service. After years of relying solely on T-Mobile infrastructure, Fi will now support a second 5G network. The company has chosen not to disclose which carrier is the new partner.
Fi debuted in 2015 as Project Fi with access to both T-Mobile and Sprint networks. The service initially launched on Google's Nexus phones, which automatically switched between carriers based on signal quality. Following T-Mobile's acquisition of Sprint, Fi consolidated to a single domestic network while retaining multi-network capabilities for international roaming.
The super network initiative restores Fi's dual-carrier status within the United States. Devices on Fi will alternate between T-Mobile 5G and another 5G network to optimize connection quality. Google's announcement deliberately avoids naming either network, referring instead to "two of America's best 5G cellular networks."
While T-Mobile's involvement is confirmed, the second partner must be either AT&T or Verizon. Google declined to identify the carrier when contacted. Based on coverage map patterns, Verizon appears to be the likely candidate, though carriers frequently adjust map details.
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MVNOs frequently withhold network information from public disclosure, and such details have become increasingly difficult to locate in support documentation. Google's Fi FAQ no longer explicitly acknowledges T-Mobile as a network partner. Previously, Google prominently highlighted its T-Mobile relationship, emphasizing that unlike most MVNOs, Fi receives priority access on T-Mobile's infrastructure. Transparency about network partnerships represents valuable information for consumers evaluating wireless plans, particularly those familiar with carrier performance in their specific locations.
The super network rollout includes several limitations. Network switching capability is currently available exclusively on Pixel 9, Pixel 10, and Pixel 11 series devices, with other phones gaining access in 2027. Additionally, traditional dual-SIM functionality is incompatible with network switching; Fi must be configured as an eSIM with all other SIMs disabled for the feature to function.
For eligible users, super network support is available immediately at no extra charge on Unlimited Premium and Flexible plans.