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T-Mobile Slides After Dish Taps AT&T as Network Service Provider

Photographer: David Paul Morris/Bloomberg

T-Mobile US Inc. suffered its worst stock decline in more than five months after rival carrier AT&T Inc. became the network provider for Dish Network Corp. in a $5 billion deal.

Under the agreement announced Monday, AT&T will become the main network for Dish, a satellite-TV company that is expanding into wireless-phone service. Dish also will let AT&T access its trove of airwaves.