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

We're still piecing together what caused Verizon's extended service blackout, but network experts point to possibilities based on how it transpired.

Verizon Communications said late on Wednesday it had restored mobile phone service and planned to offer affected consumers credits for a 10-hour outage that disrupted calls, texting and internet usage for hundreds of thousands of customers.

Verizon is experiencing a major outage across the U.S. today, with hundreds of thousands of customers reporting issues with the network on the website Downdetector. There are also complaints across Reddit and other social media platforms.

The outages appear to be happening nationwide, with the most reported locations including Seattle, San Francisco, Los Angeles, Phoenix, Dallas, Houston, Atlanta, Tampa, St. Louis, Chicago, Minneapolis, Detroit, Washington, D.C., and New York City.

Following a seven-hour network outage, Verizon will offer impacted customers a $20 credit, the company confirmed to USA TODAY.

A Verizon outage that impacted thousands of people across the country has been resolved, the wireless carrier said Wednesday night.

Verizon customers across Georgia were offline for hours. Service is back, credits are promised, but questions remain about what caused the outage.