Yes, AT&T is maintaining the 3G/UMTS and 4G/LTE networks while upgrading to 5G . Your 6S will continue to operate on 3G and 4G. The current plan is to take down 3G in 2022 but 4G will still be in place after that.
Yes, AT&T is maintaining the 3G/UMTS and 4G/LTE networks while upgrading to 5G . Your 6S will continue to operate on 3G and 4G. The current plan is to take down 3G in 2022 but 4G will still be in place after that.