What is a use of iPhone?
Yes, you'll have to pay more. You have to get a data plan that is either $15/month for 200mb or $25 for 2GB. The data plan includes unlimited usage with AT&T Wi-Fi, basic access, and Visual Voicemail.
IPhone 3GS to iPhone 4. I just bought a iPhone 3GS the day before the iPhone 4 was announced. Is there any way I can return mine with the money going towards the iPhone 4?
I'm assuming this is old as the iPhone has been out awhile, but no there is no return policy with Apple or AT&T.
What iPhone case has a warranty that if the iPhone breaks they will replace the iPhone?
None that is currently on the market. You should have your phone insured through either home content insurance or specific mobile phone insurance.
Can iPhone Sim Cards be swapped into another iPhone If so what is the process after you put the Sim in the other iPhone?
Yes it can be swapped. I actually swapped my razr's sim card to my iphone. Nothing happened. It works perfectly.
You were charging your iPhone suddenly you saw smog coming out of the iPhone where charger pin is in iPhone What do you need to do?
dude i hope u got the warranty