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Thousands of AT&T cellular customers were unable to place calls, texts or access the internet during a nationwide network outage Thursday. During the outage, AT&T urged its customers to connect to Wi-Fi to use their phones. Wi-Fi calling is a built-in feature on most Android devices and iPhones and can be turned on under the phone's settings."Some of our customers are experiencing wireless service interruptions this morning. We are working urgently to restore service to them. We encourage the use of Wi-Fi calling until service is restored," AT&T said in a statement.If Wi-Fi isn't available, there are few options for cell phone users. It's possible to switch services if a phone is unlocked, but that requires signing up online and porting your phone number.Some apps, including Google Maps, have limited service offline. Payment apps also do not use a phone's cell service to work.So, how do you use Wi-Fi calling?First, you'll want to go to the Settings app on your phone. iPhone users should tap "Cellular" and Android users should click "Connection" and then users will be prompted to turn on the Wi-Fi calling feature. Once set up, Wi-Fi calling works automatically when you’re connected to a Wi-Fi that you choose.