My iphone 3gs is not activating after updating my software with i tunes...what shall i do? cant i go back to my normal version which was ios 4.1

Question

my iphone 3gs which is not associated with this accunt is not activating after updating the sof tware, it connects to i tunes but i tunes says "we arh your unable to continue with your activation at this time, please try again later or contact customer care". my iphone aslo just says it cannot be activated or something like that every time i try. i have been waiting for 4 hours now but it still hasnt worked. how can i uninstal this update and go back to my old version which ws ios 4.1 or or ios 4,3. i dont even know what version it updated to, im assuming it is ios5 but not sure. it says try connecting to i tunes as well but it is connected and i tunes cant activate it either. my phone is connect to a wifi but it stll says no service.
i will really appreciate some help.
thanks.

Answer 1

Generally this is a sign that the iPhone had previously been
hacked/modified/jailbroken and the update relocked it to the
original wireless carrier. If this is the case, only that wireless
carrier can unlock your iPhone. You must contact them to see
if they offer unlocking and if you qualify.
Where did you acquire this iPhone?
What wireless carrier did you use before this problem?
Does the app Cydia appear on your iPhone?
What does it say when you look at Settings=>General=>About=>Carrier?