Google Fi is adding support for a second 5G network alongside T-Mobile, but the company declined to name the partner. Google announced the "super network" upgrade, which lets Fi phones hop between two carriers for better connectivity. One network is T-Mobile. The other is either AT&T or Verizon, though Google refused to disclose which.
Fi launched in 2015 as Project Fi with dual-carrier support, initially on T-Mobile and Sprint. After T-Mobile acquired Sprint, Fi became a single-network US service. The new dual-carrier model marks a return to that approach.
Network switching on the super network currently works only on Pixel 9, Pixel 10, and Pixel 11 phones. Other devices will gain access in 2027. Fi must be configured as an eSIM with all non-Fi SIMs disabled for the feature to function. Super network support rolls out now at no extra cost on Unlimited Premium and Flexible plans.
Google's spokesperson declined to comment on the second network's identity. An Ars Technica reporter's analysis of Fi's coverage map suggests Verizon as the likely partner, though coverage maps can be imprecise. Google previously promoted T-Mobile as a network partner and promised top prioritization on its towers, but the company's Fi FAQ no longer confirms T-Mobile explicitly.