Iphone not working in US
I have an Iphone 6 that was purchased in Mideast as an unlocked phone, however it will not work with my ATT sim back in the states appears to be locked. Did an locked status search and found that Unbricked-false, Unlocked-False, Unlocked - unlocked. It does mention about US Sprint/MVNO CSIM locked and blocked Policy. Please advise, Thanks
iPhone 6, iOS 8.3