hey man, i can't speak (or write) good english. I'm from Macedonia and i have the same problem. I have k800i from uk on vodafone. He was unlocked for other networks and worked fine. but i tried to update it with seus on internet (succesfully ). and the phone locked again. I can use just sims from vodafone. pls if u resolve the problem however tell me. Have a good luck with this, you'll need it. bye