yes
Yes, you can use your iPhone as a modem for your laptop provided it has wireless technology.
if the iphone is jailbroken and you have the app from cydia, yes. it is possible. at&t doesn't like you to do it though.
You can unlock your iPhone 3Gs anywhere if you have internet:)
If the iPhone is factory unlocked,yes u can use it If not,nope U have to jailbrake it and unlock it. Still no unlock for the 4-th iPhone Maybe the next week it's gonna to be a release
No. You only need to unlock an iPhone if you want to use a different cell phone company with your iPhone.
The link below is the needed software to unlock the iPhone.
You have to own it first. They will not unlock an iPhone 5 that is still being subsidised. Then you have to pay Bell Mobility $75 to unlock it. You must pay with a credit card.
you can unlock any iphone or phone at unlock att .com i did my whole familys iphones there
To unlock iPhone 3gs on iOS 4.1 you have jailbreak your device first.
Depends on your software version if you even can unlock.
The Unlock codes for iPhone 4 to unlock the service network is usually provided by Vodafone who usually verify the information with Apple.