T-Mobile is the third-largest U.S. wireless carrier by subscribers and is a cornerstone of the wireless industry in the Seattle area, which decades ago was home to pioneering companies that went on to form components of all four major U.S. wireless carriers. Headquartered in Bellevue’s Factoria neighborhood, T-Mobile employs about 5,500 people in the region, including engineering outposts in Bothell and Snoqualmie.

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