I tried many times to fix the app world icon but failed. There are two funny symbols that stick permanently at the screen. I can only recognize one of it. Screen munches but I still can use that app. Suspected there is an upgrade but I can't upgrade at all. One more symbol which I have no idea what it is. I tried to delete the old app world n download latest version. It showed either exception error or older os or showed nothing. Now my phone always hang, the camera not really function well, most of the times its really hard for me to access internet even though I did subscribe the data plan with my telco. I bought this lousy phone with data plan and contract for two years. To me blackberry phone as lousy as sony experia and in fact even worst.