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You can make the mobile phones that support this feature vibrate! to do so, you just need the vibrate command which syntax is:

If you want it to vibrate once: "vibrate [time]" If you want it to vibrate in a pattern: "vibrate [time] [time] [time] ..."

The following will make the device vibrate for 100 milliseconds.

"vibrate 100"

While this will make it vibrate in a pattern:

"vibrate 100 200 300 200 100"