iPhone Safari: Clearing the cache does not seem to be enough I'm developing a mobile website and am using an iPhone for testing it. One of the .jpgs used was faulty and displayed as a black rectangle in the iPhone's Safari browser. The code was then changed and there is now a .png image instead.
For some reason even after clearing Safaris cache that image is still black, and I need a new phone that has never visited the website before in order to display it correctly. 

Why is that happening and how can I fix it?
Sounds like an iPhone bug/feature where it will cache some images (and not clear them properly).

The fix seems to be to put a random number in a query string after the images on your site.

eg  picture1.png?2011242424

Some web frameworks will do this automatically (eg rails). Otherwise you could do this on just the affected image and see if it fixes it.