Hello when I use Turn-by-Turn navigation apps like (Sygic) it says "waiting for valid signal" and it NEVER find a signal !! I waited for like 20 minutes and no signal while my fiend's iPhone 3G connects to the satellite in seconds and works with all the navigation apps In "Maps" app I noticed that the blue dot does appear BUT the little circles the ones supposed to appear like radio waves don't appear !! I think that mean approx. location !! while also my in friend's phone the blue dot + radio waves arround it appear VIDEO EXPLAINS THE PROBLEM + BLUE DOT WAVES "waiting for valid signal"