Yes you need to activate it using iTunes, otherwise you wont be able to use it you will only see emergency calls only on the screen or a logo for USB cable pointing to an itunes logo. For the step by step procedure on how to activate iphone, just go the link http://nice-to-know-about-iphone.blogspot.com and look for the topic "Activating an Iphone"
Apps and music will work, but you can'y call people without a wireless plan.
Either apple or at&t because you need a special sim card
If you are referring to an iTunes account, they can share. They do not need separate accounts.
Iphone uses sim cards to track the user and gets all hidden information from them
does the iphone 3 have to have internet to work.
Only if the iphone is a GSM phone with a SIM card... Otherwise if it is CDMA then no, you have to activate the other iphone.
yes, it activates through iTunes. Which requires an Internet connection
No. The iPhone must be activated before it can be used. You activate iPhone by using iTunes on your computer. You will need a credit card or debit card, access to the Internet and an email address. However, the newer iPhone 3G must be activated either at the store (AT&T store in the US) or at an Apple store.
No it is different ipad has micro sim iphone does not and you have to activate it on the one you bought it with.
Go to the net 10 website (click on attached link) and then click on activate/reactivate or call 1-877-836-2368 to activate your phone and you will need your serial number that came with the phone.
Settings, General, Network
Rocket theme will work with an iPhone provided that you have the iPhone configured correctly. You may need to upgrade it if your model is not the latest version.