We have a list of those essential 10 phone numbers below. 10 Essential Phone Numbers You Need To Save Cell phones have made dealing with unexpected circumstances so much easier. Still, while having a phone (and internet) at our fingertips can be a life-saver on its own, there are some essential phone numbers you should make sure to save to your contacts list before an emergency arises. I have a couple of different ways that work for me when it comes to phone numbers. What are your most important numbers, and how do you store your numbers?