Google’s mobile virtual network operator (MVNO) service returned multi-network capability for U.S. smartphone users.

With Google Fi Wireless, users can see their service automatically switched between two 5G cellular networks and millions of Wi-Fi hotspots.

Rolling out on Pixel 9 and newer phones, the plan provides access to T-Mobile US’ network, Google’s exclusive network partner since 2023, and an unnamed second 5G network. The service also extends Wi-Fi Auto Connect+ to more locations, with Google promising seamless connectivity to “high-quality Wi-Fi in millions of locations.”

Under the hood, Google Fi’s “super network” uses multiple enabled profile (MEP) technology to allow its phones to host two eSIMs simultaneously and keep them active on dual cellular networks at the same time where available. Upon detecting weak coverage, the service automatically switches to a secondary service.

MEP is not a novel concept, having been available on Android phones since 2022. Google Fi meanwhile has allowed for multi-carrier switching since inception, hosting concurrent services on a physical SIM for T-Mobile US and Sprint before the latter’s acquisition by the former in 2020, and then T-Mobile US with US Cellular. Google ended its US Cellular partnership in 2023.