Compatible with iOS 8 and 9
Tweak which spoofs the Exchange/ActiveSync user agent, for Calendar/Mail within iOS.
This allows you to bypass Exchange servers that block your iPhone/iPad based on the "User-Agent", which includes your device's (obfuscated) model and iOS version.
Tested on iPhone6S+ on 9.3.3. Should work on iOS 8 and above, might work on other versions.
Code hosted on Github