It must be installed as Accessibility Service
If you enable "Auto. Timer" the cellular will vibrate if you have any notification.
ROOT required for the following:
To test if you have notification only pressing a key.
Produces cellular vibration if you press configured key and you have received a notification alert from configured application while cellular was locked.
Tested on HTC Desire. Maybe work on other devices (please report if works on your device)
I love this so much! I use with textplus because I don't want to use up texts and it vibrates whenever I get a text now! Exactly what I needed! DroidX