Google Fi adds second 5G network, does not name partner

Google Fi is adding support for a second 5G network in the United States, ending its years as a single-network service on T-Mobile. The company calls the upgrade its “super network.”

What is changing

Google Fi launched in 2015 as Project Fi and originally let phones switch between T-Mobile and Sprint. After T-Mobile acquired Sprint, Fi became a single-network service in the US while keeping network switching available for international travel. Now the feature is returning domestically.

Phones connected to Fi will be able to hop between T-Mobile 5G and a different 5G network to provide the best possible connectivity. Google’s announcement says only that it supports “two of America’s best 5G cellular networks.” A Google spokesperson declined to name the second network when reached by Ars Technica. Jane Harnett, Google Fi Wireless senior product manager, also declined to share which networks Fi is working with, according to The Verge.

Requirements and rollout

Network switching is rolling out starting November 10, 2026, on Pixel 9, Pixel 10, and Pixel 11 series phones. Other devices will get access in 2027. The feature requires Fi to be active on eSIM with all non-Fi SIMs disabled. Traditional dual-SIM functionality will not work if a user wants Fi to switch networks.

The feature is included at no additional cost on Unlimited Premium and Flexible plans.

How switching works

According to Harnett, the new switching is faster than Fi’s previous approach. The phone keeps two eSIM network profiles on standby at the same time using MEP technology and uses the Android OS to monitor live connection quality, allowing faster and more fluid transitions with minimal battery impact.

Why it matters

Consumers often know which carriers work best where they spend their time, but Google has not named the second network. Until Google identifies the partner, the practical benefit of the switching depends on coverage in a user’s specific locations.

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Sources

• arstechnica.com: Google Fi adds support for a second 5G network, won't say which one - Ars Technica
• theverge.com: Google Fi is bringing back multiple cell network support for better coverage | The Verge
• digitbin.com: Google Fi Super Network Adds 5G Switching for Pixel 9

This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.