Does Wordpress cache differently for mobile phones?

[Kathy Rose]

I am grasping at straws.

The presenting symptom: I'm working on a Wordpress website. Although I have changed the body background graphic a few times, that change is never updated in my iPhone. (Other changes do update--but not the background graphic. If I set a specific background for @media screen, it still doesn't update.)

My iPhone is a 4S and doesn't have a "clear cache" option in the Safari settings but I have cleared the cookies, the history and all retained website data--repeatedly. I just downloaded the latest operating system update, cleared all that stuff again, and still no change.

Soooo....my husband suggested that perhaps the website itself has a special caching system for mobile?

I thought I'd ask you guys since you know a lot more about Wordpress than I do!