A huge outage at Verizon is causing iPhones and Android devices to enter SOS mode, which prevents users from making mobile calls unless they utilize WiFi calling.

Verizon customers reported their mobile phone service was down in cities across the U.S., giving them only SOS mode.

Verizon users across the country reported service outages Monday morning after the network experienced “an issue,” a company spokesperson told The Post. Downdetector.com – which provides real-time updates on Internet and phone services – experienced a spike in reports of Verizon outages around 10 a.