Thank you for the post. Would you please clarify the following questions;
@Community - please share your expertise, thank you all!
I am dealing with the same problem. About two weeks ago I upgraded my 6s to iOS 9.2, later that day, the "update carrier settings" popped up and I accidentally hit ok. Within two hours, I found extremely poor reception in locations that I usually have good coverage. Apple has replaced phone and I have reinstalled and factory reset phone more than a dozen times with no luck. I would love to know if I could reinstall the previous carrier settings to pin point if its the iOS update or the carrier settings... Anyone know how? the last Apple rep said carrier settings can be changed but Rogers techs say its not possible and its an Apple issue!?! Who to believe?? Also, tested an identical phone (no update) and side by side works perfect.. tested a 6 with 9.2 update but no carrier settings update and that works fine as well.