Morning, MMS is NOT my priority. Only IM b-tween my wife and I but I would like the current carrier file. Running iTunes 8.2 on 3G iPhone with 3.0 OS JB'n. I DON't want to LOOSE my JB enhancements therefore I DON'T want iTunes 9.0 upgrade nor 3.1 OS. Have downloaded new Carrier file...saved to DT (running Windows Vista)...Ran Command prompt...followed steps to shift + update in iTunes...Won't update...Receive "Unknown Error message".Have redownloaded carrier file...rebooted...re upgraded several times...NO GO...Still have carrier file 4.0 on iPhone... Been told I need iTunes 9.0 but if I do that I loose JB and won't be able to regain untill Dev-Team releases JB. Any suggestions or New steps I'm NOT following. Thanx, IGoSlo