When you fall behind on your mortgage payments, you don't instantly lose your home to foreclosure. It takes time for the legal process to play out. In 2016 it took more than 1,000 days on average to complete foreclosure. That's nearly three years, which is a long time to be living in your home without paying your mortgage.
While you're living in your home sans mortgage you will continue to have other bills, but money could still be tight, and your credit's in bad shape.
If that's the situation you're in, which of your remaining bills should you pay?
Pay Your Utilities
You are not going to be able to live in your house without electricity or plumbing, so you should continue to pay your electric, gas, water, and sewage bills even when you're not paying your mortgage.