Hey, i posted this about 3 days ago in dif forum and got the same type of answers, I was not able to make my texts or emails vibrate. I got Handcent app and had many more options and settings but still no fix.
so stopped at the Sprint Repair center and they said they would have to do a factory reset. the vibrate was working when I used the volume switch down to vibrate so they figured is not the cell but some firmware. I told them I would back the next day I just needed a day to make sure my stuff loaded so far to the cell was not lost.
next day in the morning I said to my self, wait I can do the factory reset and save time and trip.
Did it and the text and email vibrate works fine like is supposed to do, all I had to do later was just get all the apps back from the market.
Done.
try it it will fix that.