Google Fi is bringing back a feature it lost years ago: a phone that moves between two cellular networks on its own, depending on which has the stronger signal.
Google calls the new setup a "super network." It switches users between two different 5G networks automatically, based on which offers better connectivity at that moment. The rollout is limited to Pixel 9 and newer phones with Fi running on an eSIM (a downloadable SIM profile rather than a physical card) and any non-Fi SIMs disabled.
This is a restoration more than an invention. When Fi launched in 2015, subscribers could switch between T-Mobile and Sprint. That ended after T-Mobile acquired Sprint in 2020 and the two networks became one, leaving Fi with nothing to switch between.
The appeal is simple. A typical phone plan ties a handset to one carrier's network, so a dead spot on that network is a dead spot for the phone. Drawing on two networks shrinks that problem, though only in places where the second network has coverage. The better-connectivity benefit is Google's pitch, and the company has offered no independent measurements of it.
The eligibility list is the other thing to notice. A feature that set Fi apart at launch now reaches only people with a recent Pixel, an eSIM and no other active SIM. Anyone on an older phone or a physical SIM stays on a single network for now.