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.
Settings, General, Network
iTunes is not required to activate the 4 or 4s. Insert SIM and turn on and follow the prompts.
activate the phone first and then sync it with your itunes on your computer
Yes, activation needs to be made through the internet.
you dont
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"
It needs to be Jailbroken then Unlocked. More info on my site.
Im not sure but i think you have to jailbreak it
Iphone uses sim cards to track the user and gets all hidden information from them
If you are referring to an iTunes account, they can share. They do not need separate accounts.
To activate your hotmail account on the iphone: 1.Go to settings 2.go to mail 3. go to activate an account 4. for what service, hit other. 5. type in the rest of your information from there.