Uploading Photos From Iphone to WordPress Without Publishing

I have a questions I feel like should be fairly easily answered…

How can you upload photos from an iphone to a wordpress blog but not publishing them. For example, I want to be able to take pictures while I am out and have them uploaded to my blog for when I get home so that I can quickly write a post and then just select the photo that I uploaded earlier.

This functionality I feel like has to be available somehow?