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Yes our forms are designed to work across most major operating systems and browsers including mobile devices. I ran a test via your form using my iPhone 4S (iOS 7.0.4 - Latest Version). Everything seemed to work and accept images normally on my end between mobile and computer. I tried this on the latest versions of Mobile Chrome and Mobile Safari.
Any idea what Firmware and which Mobile Device Types and Versions are being used on your customer's end? Also what Browsers? Perhaps they didn't select the images correctly so it may have not attached upon selection. The only other reason I could think of right now that this could be a possible issue is if perhaps your customers may have tried to upload an Image File type that wasn't allowed or supported.
Mobile Upload - Attached:
Computer - Image Uploaded and Shows Fine in Submission: