Hi everybody!! I bought my P350 in USA with this specifications GSM 850/900/1800/1900, 3G 900/2100 but I'm going to use it in southamerica where 3G is on 850MHz Band. I know there are two models P350F & P350G (F:850/2100, G:850/1900) that works in the band I need. My question: Is there any way to change or configure my cellphone to move the band from 3G 900/2100 to 3G 850/2100??? Thanx for your help.