[5] Google Fi was announced exclusively for the Nexus 6 smartphone on April 22, 2015, on the Sprint and T-Mobile networks.

[6][7][8][9] Because of high demand at launch, the service required that users receive invitations, which were gradually released throughout summer 2015.

[22][23][24] In February 2023, Google Fi and US Cellular discontinued their partnership, leaving T-Mobile as the only network usable with it in the US.

[25][26] Prior to the merger of Sprint and T-Mobile, Google Fi Wireless automatically switched between its partner networks depending on signal strength and speed.

[34] In addition to using a phone's physical SIM card, Google Fi offers a Bring Your Own Device (BYOD) option whereby the customer uses their compatible phone (Google Pixel, Android or iPhone) using an eSIM (embedded SIM) virtual card to establish Google Fi as a standalone service or in conjunction with another provider.

[35] In October 2021, Google Fi Wireless announced that it would allow end-to-end encrypted calls.

I found myself paying a little more than $20 a month for Fi, which is the least I've paid for a cell phone service, ever.

"[46] JR Raphael of Computerworld also praised the pricing strategy and network transitions.