This worked for me thanks
This worked for me great thanks !This has worked for many:
- I left my non-functioning exchange account on the phone.
- i turned off wifi
- went to Settings/General/Reset/Reset Network Settings
- phone rebooted and my Exchange account started working (on LTE)
I'll turn wifi on later...
See: https://discussions.apple.com/thread/6544887?searchText=iphone 6 not working with exchange settings