So ages ago (March 2012) I got my Galaxy SII locked to Three UK, and got it unlocked few months (June 2012) after that. However, since I've updated to Jelly Bean (in April/May-ish 2013), it got locked again. I didn't realised it got locked again until I went travelling (June 2013). I've called Three and ask for the unlock code but didn't work. I figured it's because I have entered the wrong code numerous times before, so I did a factory reset (as advised by customer care at Three as well). HOWEVER, the same code, still doesn't work. I keep on getting the "Network unlock unsuccessful" message. I'm getting a bit annoyed and frustrated now, coz I really need this phone unlocked. My questions are: 1) Could it be that my phone is frozen because of too many failed attempts to unlock it? If so, where dyou reckon I can get an unfreeze key? 2) Would rooting the phone be a good option?