- Locate the IIS Directory for the SharePoint Site in Question (for example inetpub/wwwroot/wss/VirtualDirectories/80).
- Open the folder "App_Browsers", and open the file "compat.browser" using notepad.
- Find all instances of the "isMobileDevice" attribute, and change its value from "true" to "false". So find this:
Replace it with this:
That's all you need. No IISRESET is required.