Removing Exchange Security Locks from iPhone 2.2.1

If you’ve been wondering how to disable the Exchange serve PIN requirement, here’s how to remove it. (at least partially)

1. Jailbreak

2. Use PhoneView to download /var/Managed Preferences/mobile/com.apple.springboard.plist

3. Edit the plist file and adjust settings as needed:


<key>PolicyInformation</key>
<dict>
<key>maxFailedAttempts</key>
<integer>5</integer>
<key>maxInactivity</key>
<integer>5</integer>
<key>minLength</key>
<integer>7</integer>
</dict>


4. Use PhoneView upload and overwrite com.apple.springboard.plist

5. Reboot your phone

6. Go into Settings.app and turn autolock and pin off

Note: The KillExchangeLocks application from Cydia does not appear to work.  Some people have pointed to a tightening of Apple’s security policies as the reason.  The app hasn’t been updated since the fall of 2008.

The plist is automatically updated approximately once per day, so I’ll be looking into a cron-based solution soon.

On my system, only the “passcode required” value seems to reset.  I don’t mind a 4-hour lockdown.  It seems like a reasonable amount of security.  This is much better than the 1 minute interval I was stuck with and now I can actually keep my screen from auto-locking when I use SlingPlayer.