You can transfer a broad variety of files using an iPhone USB flash drive. Some of the different applications would be for entertainment or business. If you are taking photos with your phone and do not have any remaining storage on your phone, these flash drives can also be useful in freeing up storage space without losing your shots. In addition, you may also be able to play audio and video from the drive, helping you avoid not having to use up phone storage to play your content. Some examples include: