“Previously Fi’s switching was single-SIM switching which could only connect to one network at a time, so your phone had to wait until service dropped completely before performing a slow SIM profile swap into another network without knowing if coverage was actually better there. Fi also tried dual-SIM iterations that required both a physical SIM and eSIM which could be slower to transition.
Now we are back with added networks domestically. We have rebuilt the experience from the ground up for the modern era. With our new switching on newer Pixel devices, your phone keeps two eSIM network profiles on standby at the same time (via MEP technology) and uses the Android OS to monitor live connection quality. It also lets your phone transition faster and more fluidly with minimal battery impact—knowing a better connection is available before it switches.”