I have the N70 ME(music edition) phone and its displaying the message "sim card registration failed". I am unable to make or receive calls what to do ?? I tried resetting the phone but no use(tried both *#7370# and *#7780# ).The phone resets but the problem is still there. It all started when i uninstalled a few softwares from my phone incl. guardian and full screen caller. What to do now??