If your iPhone4s got water damaged, you have to remove the battery first. What's more, you should slowly drying with a hair dryer, after one day, on the battery and try to boot. If you are luck, your iPhone can use as usual. SPAM removed
As I know , you can not copy your contacts from the iPhone (3GS) to SIM card, but you can transfer your data, including photo, songs, videos and playlist and more. The program allows you to back up and restore all of your iPod, iPhone, iPad or iPod Touch content like your favorite songs, videos, photos, play lists and more. If you want to protect your data, you can try to use iPhone transfer tool. Good luck!