A friend has an iPhone running iOS 7, and iTunes on her Windows 8 computer.
Since iPhone appears not to allow choosing a lower definition when taking pictures, her phone no longer had enough memory. She then spent a couple of hours deleting old pictures, but iPhone stills complains that there's not enough memory left, refuses to take more pictures, and tells her to upload the remaining pictures to the Cloud. 1GB worth of pictures would take too long and cost money too (in bandwidth use, storage, and time.)
Moving pictures to her Windows computer through USB would be much faster (and free, too), but at this point, when plugging the phone into the computer, iTunes no longer prompts her whether she wants to copy pictures from the phone to the computer.
I don't own any Apple product so am not used to iTunes: Does someone have an idea why it would stop prompting users when plugging the phone, how to re-enable this feature, and download pictures from her phone to make room?