Yes Best Buy had the memory card you need, and will move the data for you. But i agree with Paul, if you can do it yourself it's very easy, quick and free, definitely the better option.
I'm not computer savvy.
If the J7 uses a micro SD, yes. I don't trust Geek Squad to do anything. If you have a computer and memory card reader you can do it yourself. It is as easy as dragging and dropping files.
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