eSIM Enables OS‑Level Carrier Gatekeeping

Google Fi is reintroducing automatic switching between a 'Primary' and an unnamed 'Secondary' 5G network by using Android's eSIM multi‑profile (MEP) technology on Pixel 9 and newer devices. The switch is automatic (no manual toggle at launch), promises priority/QCI protections, and depends on the OS managing two carrier profiles on a single eSIM. — This signals a shift where device and OS vendors can programmatically choose carriers on behalf of users—raising questions about competition, consumer choice, transparency, and regulatory oversight of mobile network access.