Nothing inherent to cell phone networks causes them to go down during power outages. Just like POTS they need a backup power supply for their infrastructure to

Nothing inherent to cell phone networks causes them to go down during power outages. Just like POTS they need a backup power supply for their infrastructure to remain functional when the power grid is down. Usually this takes the form of diesel generators. The main difference is that the cell network doesn't power the handset but modern cell phones use so little power than a $50 consumer UPS would recharge a cell phone many times over. Keeping phone networks up during power outages is very important for public safety.