Verizon recently suffered a significant outage that left millions across the US without calls, texts, or internet for an entire day. This was a huge hit, restricting friends’ and families’ ability to communicate and forcing some businesses to shut down for the day. What can you do to protect yourself from the next time a mobile network goes down?

Internet outages are incredibly disruptive in our modern world. We don’t realize just how much is actually connected until everything goes down. While massive outages are uncommon, they do happen—here are 10 of the worst.