"All services have been fully restored for customers in the Northeast that may have experienced issues. We appreciate our customers' patience as our teams worked as quickly as possible to return service to normal operating levels," the company said in a statement just before 4 p.m. ET Monday.

Wireless carrier Sprint was struck with apparent network issues Monday morning, according to streams of angry tweets from customers who had intermittent or no service.

Twitter users throughout the Northeast reported issues. The outage map at DownDetector.com showed the heaviest cluster of reports from southern New Hampshire to southern New Jersey, with smaller patches in the Chicago area and northern Texas.

It was also unclear when the problems started, though the @SprintCare Twitter account was responding to users having network issues as early as 7:05 a.m. ET and was still providing similar responses almost six hours later.