Know Facts – Why Mobile Users Abandon Your Site!
Mobile Sites That Don’t Allow You To View The Desktop Site
Sites That Switch Back To Desktop Without Warning
Retailers With No Mobile Site At All
Menus That Don't Close Easily
Non-optimised Landing Pages
Directing Mobile Users To Non-Existent Pages
Strict Postcode Validation
Patronising Messages For Mobile Users
Pdf Menus On Restaurant Sites
Reference :https://econsultancy.com