Company now searching for cause of the outage, which began Tuesday and disrupted services for 5 percent of T-Mobile's customers T-Mobile USA has restored voice and data services to users after an eight-hour outage that affected nearly 1.7 million subscribers.“T-Mobile confirms it has fully restored voice and text/picture messaging services for customers affected by intermittent service disruptions on Tuesday,” the company said in a statement posted on Wednesday at 1:25 a.m., Eastern time.[ Discover iPhone apps for business and IT pros the easy way: Use InfoWorld’s business iPhone apps finder. | Get the InfoWorld editors’ 28-page hands-on look at the new iPhone OS from the perspective of business and IT pros. ] “Our sole focus has been restoring full services for all customers; we are now investigating the root cause of the incident,” it said.The outage, which began around 5:30 p.m. on Tuesday, disrupted voice and some data services for 5 percent of T-Mobile’s customers in various areas. Based on the 33.5 million subscribers that T-Mobile reported at the end of the second quarter, the outage affected nearly 1.7 million people. Technology IndustryT-Mobile