I need technical support with respect to Tmobile Carrier update 28.3 and iOS 10.3. It seems like Tmobile have re-introduced a problem that you resolved on carrier update 27.2. IPV6 only issue. Could you tell me if my understanding is correct on carrier update 28.3. Can we ask you to release a new update and put IPV4 back? We need more time to switch to IPV6. I am aware that Apple's position is to support IPV6 only.