Apple iOS devices like the iPhone, iPad and iPod Touch will display the mobile version of Twitter if you try to visit the site using the Safari browser. To access all the features on Twitter and view the full website, you can follow these steps.
Note: There used to be an option on Twitter’s site to switch to a desktop version of the site. Twitter has removed it though.
After the changes Twitter made to their site, you can no longer view the desktop version of Twitter from Safari without changing the user agent. For an easier workaround, you can start using this option.