3g network problem with iphone os 4.0.2

hi
from 2 days i upgrade my iphone 3g to os 4.0.2, and from the time i upgrade it i can't use 3g in my phone i called my ISP they told me there is problems with os 4.0.2, so i want to know how i can make downgrade to os 4.0.1 or os 4.0 to make sure that a problem from the new os 4.0.2
and thanks

Hi, i also trouble with the 3g network. I couldn't make/rec calls or send/rec text msgs but i could email - odd. I rang apple and they had me turn off the 3g setting and now i can use me phone. I assume this is a vodaphone issue and not my phone's fault as i first thought. Just an idea if any one is having similar probs.

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