I am looking for an app that will allow me to use my I phone as a 8gb pin flash drive.
One of the most popular app for turning the iPhone into a flash storage device is PhoneView (image below) it was previously called iPhone Drive and MegaPhone but had a name change. There’s a free demo so give that a try but this app is only available for Mac users. iPhone drive costs about 20 bucks.
If you are on Windows check out TouchCopy. 25 bucks to purchase.