After searching the internet have got hold of the following information. I think by tomorrow we should get something to our respite in terms of unlock:
There is unlock method if you want to unlock the 3G/3GS. However, that is not the point. I still would like to know how you manage to put 4.3 onto the 3G? 3G latest firmware is 4.2.1 and Apple will not come out any update firmware higher than 4.2.1 for 3G.