no you can use the mobile network for Internet
are you serious! of course not internet is oppositional or at least back then but you will never need internet for the iPhone to call
Yes. AT&T offers services that allow the iPhone to access the Internet wherever there is a cellular data signal. Or, the iPhone can connect to a WiFi network to access the Internet without the need of an AT&T plan.
You get faster internet then the original iPhone.
yes, it activates through iTunes. Which requires an Internet connection
AT&T requires you to at least get the ~$20 Internet package with the Iphone. You can also use your WIFI connection, but you still need the AT&T package
No, only an internet connection to download it and to make in app purchases.
Yes or public wifi
No. It can use your 3g
No, you do not need an internet connection to back up an iPhone using iTunes. The backup process occurs locally on your computer, where iTunes stores your device's data. However, you will need internet access to download iTunes or update it if it's not already installed on your computer.
No, you do not need to buy internet from AT&T when you purchase an iPhone. You can buy the iPhone unlocked or through other retailers and choose any carrier or plan that suits your needs. However, if you buy the iPhone through AT&T, it may come with specific plans or offers tied to their services.
Yes, it costs extra for the internet on the iphone.