I purchased an unlocked Galaxy Note from Germany. I have AT&T unlimited data and I insert my sim card and at first there is only phone signal. I reset the phone and tried again and this time it says to insert sim card which is already in the phone. It is not recognizing the sim and cannot find the carrier. Now there is a circle with a slash through it where the signal bar indicator was. I tried the sim card back in my galaxy s2 and it works fine phone and data. Anyone have any ideas?