I need help! I bought my Google Nexus S GT-i9023 and I didn't know that the carriers in my country were only supported (3G) either by 850 or 1900. The nexus s doesn't have no support for those... What do you recommend me to do? Is there a way to change that? like changing something in the phone so it can accept 850 or 1900? Please help! i'm about to cry!!