is it possible to downgrade version 4.0.2 to version 3.1.3 on my iphone

~~aznhippy~~

New member
3G(8gb) and be able to unlock it? Can anyone tell me if it's just my phone or it's a common problem that my iphone 3G with version 4.0.2 unlocked seemed to be very laggy!!It's somewhat frustrating~~So i'm wondering if it's possible to downgrade it back to version 3.1.3 and still be able to unlock it, if it is, could anyone tell me a way to do it, THANKS So MUCH~~

PS.: my frend tried to do that on his, and he said he was able to downgrade it, but after he tried to unlock it and put simcard in, a message saying something like "a different sim card has detected..." and is stuck with the emergency call thing....so it didn't really work for him....PLEAZ HELP@@
 
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