How does this USB app work On IPhone
I do not understand you question. What USB app? How am I supposed to know?
USB DISK by liu jan jun
Wy don't you ask the app developr
this is a user helping user forum
ios have more then a few apps available
so spc app questions will get more productive replys
in the forums for the developer or app in question
It allows you to store various documents on your phone. You must use iTunes to transfer the documents. It does not turn your phone into a "USB Stick", if that's what you were thinking.
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