Verizon says its network is fully restored. Here's what to do if you still don't have service.

Verizon said its network has been fully restored and cell service is back available to customers across the country after an outage on Monday that left many people unable to make or receive calls for much of the day.

People across the country said their phones had no service other than SOS mode, meaning their phones were having trouble connecting to a wireless network. However, when a phone is in SOS mode, Apple says it can still make emergency calls like 911 by connecting to other wireless carriers.

The outage began shortly after 9 a.m. ET on Monday and continued into the evening. At 8 p.m., Verizon told CBS MoneyWatch that its technicians had fully restored the network after an “outage that affected some customers.”

“Service has returned to normal levels,” the spokesman said.

What happens if your phone is still in SOS mode?

Verizon said people who are still having problems connecting to its network should restart their mobile device.

According to Apple, people with iPhones can also try to reconnect to their cellular network by turning on “Airplane Mode” in Settings for at least 15 seconds and then turning Airplane Mode off.

“We know how much people rely on Verizon and apologize for any inconvenience this may cause. We appreciate your patience,” Verizon said.