Yes you can, many places will give you a PSP in exchange for a DS, and a sum of money to cover the difference.
Nothing.
No, PSP games should be played on a PSP and DS games should be played on a DS. I dont think that the DS can take the PSP graphics and the resolution.
Trading between an DS and a DS lite is the same as between a DS and a DS. There is no difference.
You can get sims castaway on both PSP and the DS
I think it's better for the PSP because I have it for the PSP and my cousin gas it for DS and PSP and he said the PSP is better.
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Yes the PSP does have better graphics than the DS
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