Originally Posted by warriorvibhu
this does not seem to be a correct reply.. i dont have a solution .. but i would say if your phone is new get a replacement..Before that make sure you are using default sms app and not handcent sms or some other app.. if u are using some market app.. open the app press menu and check its settings...
Not vibrating when receiving an SMS seems to be quite common on android devices. It's not a hardware fault, no need to return it therefore...
This problem is solved by installing the application Sound Manager and changing the vibration settings in that application. You can uninstall it afterwards again if you don't want to keep it without affecting the vibration behaviour.
An additional problem on the Wildfire is that you simply can't find the application Sound Manager on the market (probably because of it's QVGA screen).
I described here above a way to find and
install this application.
I'll leave it to the original poster to decide if he wants to read more about the solution I suggested and possibly try it afterwards.
I just know it worked for me...