NEW YORK — Sprint Corp., the third-largest U.S. wireless carrier, said it will cut about 800 customer service jobs, including more than 100 in north Fort Worth, in the largest employee reduction since SoftBank Corp. acquired a controlling stake in the company last month.About a third of the workers — 284 employees — are based in Texas, including 106 at a Fort Worth call center and 13 in Irving, according to a notice filed with the Texas Workforce Commission. The largest layoff in the state is in Temple, where 165 jobs will be cut.Customer complaints have decreased and satisfaction levels are higher, requiring fewer positions, Sprint said. It also has fewer users to serve. The company, based in Overland Park, Kan., shut its Nextel network in June as part of a plan to revamp its technology, contributing to a loss of 1.05 million monthly subscribers in the second quarter.The firings are “organizational adjustments being made to meet the changing needs of our business, ”spokeswoman Jennifer Schuler said in an email. Sprint started notifying most of the affected employees last week.Sprint plans to keep its total workforce steady at about 40,000, Schuler said. “Sprint continues to hire new employees into positions that support our corporate strategy,” she said.SoftBank, based in Tokyo, completed its $21.6 billion takeover of the company last month.Sprint fell 2.3 percent to $6.75 at the close in New York. The shares have jumped 22 percent this year. Staff writer Jim Fuquay contributed to this report.