I can reproduce this on my iPad Air, but not on my iPhone 6.
The Settings App crashes when trying to add or edit email signatures
When attempting to make changes in Settings > Mail, Contacts, Calendars > Signatures the Settings App will crash.
Bug First Encountered
Device(s) bug has been encountered on
How often the bug occurs
The bug hasn't occurred for me on my iPad mini 2
Attempting to delete the first character in the signature is what causes the crash. 100% on a 5S running 9.1 and latest 9.2 beta 3.
I have tried to reproduce this bug, but