The carrier says the outage is over and has apologized to customers. Here’s the latest on the issue — with no clear cause yet.

Verizon has finally confirmed what caused yesterday's nationwide outage. The company shared a statement with Mashable, confirming the outage stemmed from a software issue. Verizon specified the outage was not caused by a cyberattack.

Some Verizon customers went without cell service for over seven hours on Jan. 14. Here's what we know about the cause of the 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.

A company spokeswoman said “a software issue” was to blame for the outage, which disrupted cellular and data service for over six hours across the United States.

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

Verizon says a software problem caused the glitch and they are conducting a postmortem, but experts say outages are "a fact of life" these days.

Verizon is issuing accounts credits to customers affected by yesterday's major outage. You might not be thrilled by the number, though.

Is Verizon wireless network down today? Customers are reporting service outages via SOS mode on iPhone. What you need to know.