Ask HN: Please help me find or build this simple mobile photo app

I need a really simple mobile app to test a product idea. The user just needs to be able to take pictures and upload them to a server. No additional features. Is there any existing app I can use to do this? I don't mind using any app, as long as it can upload the photos to a server specified by me. For example, if instagram had an API which let me do this, I would use it. Or as a mobile newbie, but decent web app hacker, how quickly can I build this? I would like it to work on both iOS and Android. Is PhoneGap a good option? Thanks!