pavanraj wrote:
iphone 3gs loaded with latest os 4.0
If the iPhone had the 4.0 Beta loaded on it, the iPhone needs to be registered with a developer for the iPhone to even function. If it's not registered and the beta is installed then it is a brick. Regardless of if it is registered or not, as Tamara said the iPhone 4.0 Beta has no support. The Beta is a beta and is for developers who are developing apps. That way they can release apps as soon as the OS 4.0 is released sometime this summer. You should get an error message saying something along the lines of this phone is not registered with a developer, if the iPhone is not registered.
pavanraj wrote:
I want to activate it without at&t sim as its factory unloacked.
If it is unlocked by the carrier then you just need to plug it into iTunes with a SIM card from a compatible carrier. If you get a message saying that the SIM is not from an authorized carrier, well then the iPhone is not unlocked, sorry.
If the iPhone is not unlocked you are really out of luck. While there are ways to hack an iPhone to unlock it, there are no methods for the 4.0 Beta to unlock the iPhone, and even if there is a way to hack it to unlock the iPhone 3GS on the 4.0 OS, it won't come for a long time.