A huge business deal affects the region's fourth largest private employer. Yesterday, AT&T announced its buying T-Mobile in a cash and stock deal valued at $39 billion. This will make AT&T the largest cell phone company in the U.S. Currently, Verizon is the biggest. It would also reduce the number wireless carriers with national coverage from four to three and the plan is sure to face close regualtory scrutiny. T-Mobile has a Customer Service Call Center in Redmond that opened in 2004 with about 250 employees and has grown to about 850 workers as of April 2009. That's according to Economic Development for Central Oregon (EDCO).