No. The iPhone 3GS is sadly a GSM only phone, so it cannot function on Sprint (or Verizon's) bandwidths.
No because even if it is unlocked sprint works on a CDMA and AT&T works on a gsm signal it's like trying to use AM on FM radio only
Yes
Yes it does.
I tried it with my 3GS and it does work.
Probably not, they have different exterior shapes.
i am pretty sure at&t. more people have switched because of the iPhone3G and iPhone 3GS
iPhone 3gs
iPhone 3GS
the iphone 3gs replaced the iphone 3g.
Dose the iphone 3gs have a radio
If you mean,' Do iPhone 3GS's have Verizonservice?'No, not anymore, as of 17/10/2011 you can only get the iPhone 3GS on AT&T!
no why do you think its called trading in?