How much does the iPhone 4s cost now in days?

I had a iPhone3Gs for 1 year && iWanna change to the iPhone 4s… But first iWanna know how much for it && can iJustt put in my sims card && takke it out of the iPhone3Gs && put it in the iPhone 4s. Or what?

If you are already in a contract (probably), then you have to wait for your contract to finish (probably one more year) or wait until you're eligible for an upgrade. If you don't do that, then if you buy an iPhone 4S now you won't get it at the discounted new-contract/upgrade price, OR you'll have to pay a penalty to leave you contract early.

Depends were do you buy it i paid 400 today

You can look up the prices of getting a new iPhone on the Apple website!

http://www.apple.com/....apple.com

If you are outside the USA head to your country's website and take a look. Also check out your local phone store's prices!

When you make the switch from your 3GS to the 4S you'll just need to back up your device in iTunes then transfer that backup to your new phone!

It's really easy and there are plenty of articles on it on the Apple Support website!

http://support.apple.com/.../kb/ht1766

Best of luck and enjoy your new Apple Device!