Fourth quarter 2011 operating expenses, excluding the cost of equipment sales, remained consistent sequentially and year-on-year as cost savings programs in 2011 helped control expense growth.

ENGADGET: T-Mobile lost more customers in Q4, will launch LTE in 2013 with AWS spectrum from AT&T

Improve operational efficiencies, expense control and service through investments in technology and more productive use of existing resources and lower-cost operations centers.

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