"Well, if such a disruption happens again, there are things you can do. Beyond setting up a backup carrier, you can also tap into another option on your phone: Wi-Fi calling. As long as you're able to connect to a nearby Wi-Fi network, you can make and receive phone calls in a pinch. Also: Verizon reveals cause of massive outage (and how to get your free $20 credit)"
"Wi-Fi calling has been available since the iPhone 5c. Almost all carriers in the US support this feature. But you can check the status for your carrier and country via Apple's page on " Wireless carrier support and features for iPhone ." Select your region and look for your carrier. Check the bullet point items to see if Wi-Fi Calling is listed."
Mobile services can fail during outages, leaving people unable to call or text during emergencies. Wi‑Fi calling allows audio and video calls over a nearby Wi‑Fi network when cellular service is spotty, weak, or completely down. iPhone and Android phones each offer Wi‑Fi calling and most US carriers support the feature. On an iPhone, enable Wi‑Fi Calling via Settings > Cellular > Wi‑Fi Calling and accept the prompt that explains what information is sent to the carrier. Some carriers offer a Prefer Wi‑Fi While Roaming option to reduce data costs when roaming.
Read at ZDNET
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