This Simple Trick allows you to uninstall OEM apps on WP
Now winphonehub.org reader Aakash Sharma has found a way to uninstall these apps, and the hack is pretty simple.
Simple go to settings > date + time and change the calender date and time zone to 2115 and Amsterdam, as show in the video, and you will be able to un-install glance , feedback apps , storage cleaner etc.
You can reinstall the apps with SYSpusher, which can be found in the Windows Phone Store here.
The trick works with both windows phone 8.1 and 8.0.