Verizon Wireless, the largest U.S. mobile phone operator, said engineers had restored 4G data service after the second disruption this month.

Verizon Wireless 4G LTE service was returning to normal this morning after company engineers worked to resolve an issue with the 4G network during the early morning hours today, the company said in an e-mailed statement. The Basking Ridge, New Jersey-based carrier didn’t disclose the nature of the repairs.

Users began reporting a lack of 4G data connections on their phones and sporadic 3G service early today, said Thomas Pica, a company spokesman. Verizon Wireless’ 4G LTE Community forum shows users in Michigan, Virginia, Pennsylvania, Nevada and New York said they lost service.

The company, a joint venture between Verizon Communications Inc. and Vodafone Group Plc, had a 4G LTE service disruption of almost 24 hours starting on Dec. 7. Verizon Wireless said that by the evening of Dec. 8 service was fully restored after a “network operations team resolved a technical issue.

A few 4G users said they’d been able to get onto the data network by switching down to CDMA. Some people who had gotten through to Verizon phone support say the company was aware of the issue but has yet to resolve it.

This second failure comes at an unfortunate time for Verizon customers looking to renews their contracts with “Big Red” who until recently, have had relatively consistent 4G service since the service launched approximately this time last year. Now, customers have had to deal with two major data outages in one month.

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