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Android Authority has learned of widespread reports that Verizon wireless service is down across the US today.
Thousands report issues with Verizon services. Discover the details of the recent outage affecting mobile connections.
In short, when you see SOS on your phone, it means you're not connected to a cellular network. "If you see SOS or 'SOS only' in the status bar, your device isn't connected to your cellular network, but you can still make emergency calls through other carrier networks," reads an Apple support page on the feature.