Wi-Fi can easily serve as a backup for your cellular network for calling and texting, especially if you find yourself without signal.

Cellular coverage still isn't perfect—there are still plenty of times you might find yourself losing a call or unable to make the call in the first place. That's where wifi calling comes in.

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?

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?

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.

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?