Steps:
1. Go to the portal page
2. Enter the settings menu
3. Set mobile mode to enabled
4. Enter gameplay

Bug(10/10): Mobile mode doesn't function, and doesn't appear to change anything in the UI. The links and entry fields are extremely small making them very hard to press.

Note 1: This occurs on both the iPad Mini and iPod Touch.
Note 2: A screenshot has not been provided, but can be uploaded somewhere if requested.

Update: LittleItaly pointed out that you need to go to m.earthempires.com to get the mobile version, so the bug is that it doesn't automatically take you there when using a mobile device.