I have an i858 with a 3GX postpaid account. When I lose the 3G signal I get no service. If I put my postpaid TOT3G sim in the i858 when I lose the 3G signal the phone roams to AIS. I called I-Mobile and they just say some number cannot roam. Their website in Thai says it can roam. They don’t want to fix problem just say this number cannot roam. That is stupid. Without roaming I will cancel their service when my free 3 months are over and get another TOT sim. Anybody else have this problem?