Vox insufficent memory

I'm trying to get more apps and its telling me I have insufficent memory.


will I solve this problem by buying a larger micro memory thingy? I can't off hand remember what size I did buy, but probably a small one, (do they come in 4), as I had only planned on using it as a reader

If I buy another one, should I stick with small again, maybe an 8, and use both? or if I get a 16 how do I copy the small one onto the big one

thanks