Millions of Verizon Wireless customers across the country were hit with a massive service outage on Wednesday that left many wireless customers unable to call, text, or access the Internet for much of the day.

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.

The mobile giant says the issue has now been resolved and that impacted customers will be contacted directly about credits. Yesterday, customers of Verizon Communications across the country picked up their phones only to discover that they had no service.