Sprint (S) fell to last place in a Consumer Reports consumer ranking of service quality among the nation’s four biggest wireless firms, but shares were up in mid-day trading Thursday. Consumer Reports said Sprint fell to fourth from No. 2 in its annual survey of wireless service quality. “Sprint received dismal marks this year for value, voice, text and 4G reliability,” said Consumer Reports. Sprint ranked second, behind No. 1 Verizon Wireless, a