I recently bought a Samsung Galaxy SII which in general has worked perfectly for me. My only issue is that the phone won't report the signal strength. If I get to the phone information (using the * # * # 4636 # * # code) the system reports the signal strength as zero which is impossible (since I have loads of reception issues in my home). My guess is that the information is being blocked, but I don't know why or how to unblock it.
The phone is running in GSM/WCDMA (Auto Mode) with the stock ROM