if someone search and send any message to my phone via bluetooth, his phone will restart, this was the trick, in order to do this ,need to rename bluetooth as done, that's why i renamed so.
A friend suggested me coz he used to this trick with his 6680 very successfully.
Ok..I never heard of that trick. But ofcourse naming it to such a lengthy name may provoke a restart. Once I saved a number with a very lengthy character and tried to save it. It got saved, but when I tried to call that number, the phone restarted.
So this is character compatibility issue. And that's why I think you are not able to open ur Bluetooth settings.
Rename it back to simple name and try opening the settings.