> It is also worth noting that many cell towers and virtually all telco central offices have backup power, so you do not necessarily lose the ability to communi

> It is also worth noting that many cell towers and virtually all telco central offices have backup power, so you do not necessarily lose the ability to communicate the moment the lights go out on your block. One day in 2017, power went out in my neighborhood in San Francisco. My building's fiber (Webpass) stopped working. Shockingly, my mobile phone service (Verizon) stopped working completely. It showed 4 bars but no data would get through, not even SMS. I realized that the mobile providers are happy to provide zero disaster resilience. I expected that a local cell would refuse connections when it loses its uplinks, then handsets could connect to nearby cells or other company's networks. But no, the local Verizon cell captured my handset and provided no service. Is there any way to blacklist a GSM cell on iOS?