The sever didn’t provide the full sized images on large pictures, so you couldn’t zoom in the phone simply didn’t have that information.
The iPhone was released June 29, 2007 but announced in January. “On 7 November 2007, Opera Mini 4 was released. According to Johan Schön, technical lead of Opera Mini development, the entire code was rewritten.[28] Opera Mini 4 includes the ability to view web pages similarly to a desktop based browser by introducing Overview and Zoom functions, and a landscape view setting. In Overview mode, the user can scroll a zoomed-out version of certain web pages.[29] Using a built-in pointer, the user can zoom into a portion of the page to provide a clearer view”
The iPhone was released June 29, 2007 but announced in January. “On 7 November 2007, Opera Mini 4 was released. According to Johan Schön, technical lead of Opera Mini development, the entire code was rewritten.[28] Opera Mini 4 includes the ability to view web pages similarly to a desktop based browser by introducing Overview and Zoom functions, and a landscape view setting. In Overview mode, the user can scroll a zoomed-out version of certain web pages.[29] Using a built-in pointer, the user can zoom into a portion of the page to provide a clearer view”