Verizon Wireless, the largest U. S. mobile-phone carrier, won’t sell handsets with Microsoft Corp. ’s Windows Phone 7 operating system when it debuts this year, a blow to the software maker’s efforts to reach a broad market.

Verizon Wireless, the largest U. S. mobile-phone carrier, won’t sell handsets with Microsoft Corp. ’s Windows Phone 7 operating system when it debuts this year, a blow to the software maker’s efforts to reach a broad market.