AT&T announced Wednesday it will add 200 new jobs to a call center in Carter County and also addressed concerns about its wireless network in the state by announcing new investment in cell sites.The call center, which first opened in 2001, currently has about 1,000 employees. AT&T will not ask for any state tax incentives for the call center expansion. The average pay for the new jobs will be between $10 and $14 hourly.