Verizon says it's working to restore service. But if your Verizon device still shows "SOS" instead of service bars, you're affected by today's outage.

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.

Verizon encountered serious technical issues Wednesday that knocked out service for thousands of customers across the country. It took the U.S.’s biggest wireless carrier more than 10 hours to fully restore service.

New York State Assembly member Anil Beephan called on the Federal Communications Commission to investigate the hourslong service outage.

Verizon’s outage yesterday was bad, but it proved the company knows one thing: When things go wrong, humans want to speak to humans.

Tess Coward, a 27-year-old PR professional based in New York City, woke up feeling under the weather on Wednesday. But without the ability to make phone calls or receive text messages, she couldn’t get in touch with her doctor or log into the provider’s patient portal.