I have an iPhone 3G that my wife is willing to take off my hands
if I would like a 3G S. I can upgrade her phone for the 199 for a 16gb 3G S and swap phones. I want to keep our phone numbers the same though. I just wonder 3 things:
1) To keep our numbers after they activate the 3G S can I just swap sim cards?
2) Do I have to re-buy all of my apps or can I just sync with iTunes?
3) Can I sync 2 iPhones to the same computer?
Thanks for the help.

1) To keep our numbers after they activate the 3G S can I just swap sim cards?
2) Do I have to re-buy all of my apps or can I just sync with iTunes?
3) Can I sync 2 iPhones to the same computer?
Thanks for the help.