Yes you can, many places will give you a PSP in exchange for a DS, and a sum of money to cover the difference.
Yes.
no
Unfortanatly you can NOT do that because the PSP is more then the Nintendo Ds and they are in diffrent companys. Sorry
your choose
No. because the PSP costs more. But you can probably trade A Sony PSP for a Nitendo DSi. =] yes actually you can you just need extra money
Yes and no. Yes being you can turn your Ds in at a gamestop and get a PSP, and no being that you will still need to pay some money due to the fact that they will not give you a PSP for just turning in a un-equivalent system.
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.
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.
psp
the psp
PSp