What can you do with a UV sonic screwdriver?

A month ago I bought a Sonic Screwdriver of the 9th and 10th Doctors. I have been trying to look up what cool things this sonic screwdriver can do. So far I can only do one thing, make an iPhone 3Gs screen brighter. It is kind of cool to do this but I want to do more stuff. I know that the screwdriver is a prop for fake uses but the power of a UV light amazes me! I would like to know if any of you people who bought the sonic screwdriver UV light know if it can do something impressive.

Are you sure you don't mean IR and not UV? I don't really see how UV could do anything to an iPhone, let alone any other electronic device…

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