Just bought a used iPhone 3G and downloaded cydia, installous, ect. But when I put my none at&t SIM card in, it says "searching" and lags / freezes and the crashes.. I have the source ultrasn0w and the utility ultrasn0w.. My friend said to click settings>Carrier>auto find but I don't see where that is.. Under networks there isn't anything I can use, I don't think, I could be wrong...thanks!